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How to test the sharpness of a knife?


What type of knife should I carry while rock climbing?Canadian Law with respect to knivesWhat are some simple tasks to teach knife safety?Tactical Folder vs traditional knife patterns for EDCHave mainstream knife steels improved in the last generation?Restore knife to factory sharp conditionAre there any non-legal advantages of a non-locking knife?How can I make an obsidian knife?How to sharpen a peculiar looking knifeHow to follow an existing angle when sharpening?













4















In order for knives to be useful, they need to be sharp. If I am sharpening one myself, how do I know when I am done?



What would be a simple easy test of whether a knife is sharp enough?






knives knife-sharpening







share|improve this question



















  • 4





    Note that after honing and using knives repeatedly in similar situations, you will start to learn when the knife is honed to the finest edge without testing. The way the knife feels against the steel tells you where it is in the honing process, once you've learned how that changes with sharpness. And also you can learn to feel the sharpness with a thumb, but it's hard to describe what it feels like - you just have to feel it and then try using the knife and then remember which feelings match with more sharpness. At home the ultimate test is a ripe tomato (IMHO).

    – Todd Wilcox
    3 hours ago
















4















In order for knives to be useful, they need to be sharp. If I am sharpening one myself, how do I know when I am done?



What would be a simple easy test of whether a knife is sharp enough?






knives knife-sharpening







share|improve this question



















  • 4





    Note that after honing and using knives repeatedly in similar situations, you will start to learn when the knife is honed to the finest edge without testing. The way the knife feels against the steel tells you where it is in the honing process, once you've learned how that changes with sharpness. And also you can learn to feel the sharpness with a thumb, but it's hard to describe what it feels like - you just have to feel it and then try using the knife and then remember which feelings match with more sharpness. At home the ultimate test is a ripe tomato (IMHO).

    – Todd Wilcox
    3 hours ago














4












4








4








In order for knives to be useful, they need to be sharp. If I am sharpening one myself, how do I know when I am done?



What would be a simple easy test of whether a knife is sharp enough?






knives knife-sharpening







share|improve this question
















In order for knives to be useful, they need to be sharp. If I am sharpening one myself, how do I know when I am done?



What would be a simple easy test of whether a knife is sharp enough?






knives knife-sharpening




knives knife-sharpening






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 10 hours ago







Charlie Brumbaugh

















asked 11 hours ago









Charlie BrumbaughCharlie Brumbaugh

49.1k16138282




49.1k16138282







  • 4





    Note that after honing and using knives repeatedly in similar situations, you will start to learn when the knife is honed to the finest edge without testing. The way the knife feels against the steel tells you where it is in the honing process, once you've learned how that changes with sharpness. And also you can learn to feel the sharpness with a thumb, but it's hard to describe what it feels like - you just have to feel it and then try using the knife and then remember which feelings match with more sharpness. At home the ultimate test is a ripe tomato (IMHO).

    – Todd Wilcox
    3 hours ago













  • 4





    Note that after honing and using knives repeatedly in similar situations, you will start to learn when the knife is honed to the finest edge without testing. The way the knife feels against the steel tells you where it is in the honing process, once you've learned how that changes with sharpness. And also you can learn to feel the sharpness with a thumb, but it's hard to describe what it feels like - you just have to feel it and then try using the knife and then remember which feelings match with more sharpness. At home the ultimate test is a ripe tomato (IMHO).

    – Todd Wilcox
    3 hours ago








4




4





Note that after honing and using knives repeatedly in similar situations, you will start to learn when the knife is honed to the finest edge without testing. The way the knife feels against the steel tells you where it is in the honing process, once you've learned how that changes with sharpness. And also you can learn to feel the sharpness with a thumb, but it's hard to describe what it feels like - you just have to feel it and then try using the knife and then remember which feelings match with more sharpness. At home the ultimate test is a ripe tomato (IMHO).

– Todd Wilcox
3 hours ago






Note that after honing and using knives repeatedly in similar situations, you will start to learn when the knife is honed to the finest edge without testing. The way the knife feels against the steel tells you where it is in the honing process, once you've learned how that changes with sharpness. And also you can learn to feel the sharpness with a thumb, but it's hard to describe what it feels like - you just have to feel it and then try using the knife and then remember which feelings match with more sharpness. At home the ultimate test is a ripe tomato (IMHO).

– Todd Wilcox
3 hours ago











6 Answers
6






active

oldest

votes


















11














Try to slice a piece of paper. A good sharp knife makes a clean cut. A dull knife makes either a ragged cut, or worse, just pushes the paper to the side. I like this article: https://www.fieldandstream.com/articles/hunting/2014/08/paper-cut-testing-blade-sharpness#page-4 and YouTube is full of videos of people showing off their knives via this test.






share|improve this answer


















  • 2





    Generally speaking though paper dulls knives very quickly and should not be done often unless you like to sharpen often.

    – Nate W
    1 hour ago


















7














The back of a fingernail can be a good rough indicator while you're sharpening - see if it "catches" when you apply very gentle pressure at ~45 degree angle. This can also be a good way to check if the edge still has any dull spots.






share|improve this answer






























    2














    Slice a tomato with very little pressure. This is almost always when I notice a knife needs sharpening, and the difference is profound.






    share|improve this answer








    New contributor




    Oscar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.



























      1














      You hold it edge up and then you let a silk scarf slowly float down over it. It should be cut neatly in half.






      share|improve this answer


















      • 4





        Ah yes, let me just whip out one of my collection of silk scarves that I keep for just this occasion and - what the? Kevin Costner and/or Whitney Houston!? What are you doing here?

        – MikeTheLiar
        3 hours ago






      • 2





        @MikeTheLiar if you're not traveling with your juggling kit, you're not prepared for the outdoors.

        – Sdarb
        3 hours ago






      • 2





        Juggling scarves is for amateurs. I juggle the knives. I know they're sharp when I wake up in the hospital.

        – Oscar
        1 hour ago


















      1














      The best method in my opinion is one that must be learned, and involves moving your thumb across the blade, perpendicular to the blade not down it! It's very difficult to describe the feeling but if you do it on enough dull blades and sharp blades you will begin to be able to tell the difference.



      One other thing I will do if im sharpening a knife for a friend or coworker to display how sharp it is is shave a couple hairs off the back of my hand. Lick your thumb, moisten the patch on the back of your hand and shave as you would with a straight razor. (You may want to wipe the knife clean after this.) Sounds weird but i do it because your average joe will know its extrememly sharp if you can shave with it and be careful with it.



      One other test could be to attempt to very thinly slice a tomato, with and exceptionally sharp knife you should be able to get nearly paper thin slices with a light sawing motion.






      share|improve this answer






























        0














        the best test for if your knife is sharp enough is to place it in a stream with the water flowing over the blade. If your knife is sharp, leaves and fish that flow past it will be cut, but if it's the sharpest, then only leaves will be cut but fish will be okay.



        source: https://en.wikipedia.org/wiki/Masamune#Legends_of_Masamune_and_Muramasa






        share|improve this answer








        New contributor




        Sdarb is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
        Check out our Code of Conduct.















        • 2





          -1 A legend is no answer.

          – Jan Doggen
          3 hours ago






        • 1





          We're looking for stuff that works in the real world, not stuff that works in legends.

          – Mark
          2 hours ago










        Your Answer








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        6 Answers
        6






        active

        oldest

        votes








        6 Answers
        6






        active

        oldest

        votes









        active

        oldest

        votes






        active

        oldest

        votes









        11














        Try to slice a piece of paper. A good sharp knife makes a clean cut. A dull knife makes either a ragged cut, or worse, just pushes the paper to the side. I like this article: https://www.fieldandstream.com/articles/hunting/2014/08/paper-cut-testing-blade-sharpness#page-4 and YouTube is full of videos of people showing off their knives via this test.






        share|improve this answer


















        • 2





          Generally speaking though paper dulls knives very quickly and should not be done often unless you like to sharpen often.

          – Nate W
          1 hour ago















        11














        Try to slice a piece of paper. A good sharp knife makes a clean cut. A dull knife makes either a ragged cut, or worse, just pushes the paper to the side. I like this article: https://www.fieldandstream.com/articles/hunting/2014/08/paper-cut-testing-blade-sharpness#page-4 and YouTube is full of videos of people showing off their knives via this test.






        share|improve this answer


















        • 2





          Generally speaking though paper dulls knives very quickly and should not be done often unless you like to sharpen often.

          – Nate W
          1 hour ago













        11












        11








        11







        Try to slice a piece of paper. A good sharp knife makes a clean cut. A dull knife makes either a ragged cut, or worse, just pushes the paper to the side. I like this article: https://www.fieldandstream.com/articles/hunting/2014/08/paper-cut-testing-blade-sharpness#page-4 and YouTube is full of videos of people showing off their knives via this test.






        share|improve this answer













        Try to slice a piece of paper. A good sharp knife makes a clean cut. A dull knife makes either a ragged cut, or worse, just pushes the paper to the side. I like this article: https://www.fieldandstream.com/articles/hunting/2014/08/paper-cut-testing-blade-sharpness#page-4 and YouTube is full of videos of people showing off their knives via this test.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered 9 hours ago









        cobaltduckcobaltduck

        3,4811030




        3,4811030







        • 2





          Generally speaking though paper dulls knives very quickly and should not be done often unless you like to sharpen often.

          – Nate W
          1 hour ago












        • 2





          Generally speaking though paper dulls knives very quickly and should not be done often unless you like to sharpen often.

          – Nate W
          1 hour ago







        2




        2





        Generally speaking though paper dulls knives very quickly and should not be done often unless you like to sharpen often.

        – Nate W
        1 hour ago





        Generally speaking though paper dulls knives very quickly and should not be done often unless you like to sharpen often.

        – Nate W
        1 hour ago











        7














        The back of a fingernail can be a good rough indicator while you're sharpening - see if it "catches" when you apply very gentle pressure at ~45 degree angle. This can also be a good way to check if the edge still has any dull spots.






        share|improve this answer



























          7














          The back of a fingernail can be a good rough indicator while you're sharpening - see if it "catches" when you apply very gentle pressure at ~45 degree angle. This can also be a good way to check if the edge still has any dull spots.






          share|improve this answer

























            7












            7








            7







            The back of a fingernail can be a good rough indicator while you're sharpening - see if it "catches" when you apply very gentle pressure at ~45 degree angle. This can also be a good way to check if the edge still has any dull spots.






            share|improve this answer













            The back of a fingernail can be a good rough indicator while you're sharpening - see if it "catches" when you apply very gentle pressure at ~45 degree angle. This can also be a good way to check if the edge still has any dull spots.







            share|improve this answer












            share|improve this answer



            share|improve this answer










            answered 7 hours ago









            tempest_coltempest_col

            4145




            4145





















                2














                Slice a tomato with very little pressure. This is almost always when I notice a knife needs sharpening, and the difference is profound.






                share|improve this answer








                New contributor




                Oscar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                Check out our Code of Conduct.
























                  2














                  Slice a tomato with very little pressure. This is almost always when I notice a knife needs sharpening, and the difference is profound.






                  share|improve this answer








                  New contributor




                  Oscar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                  Check out our Code of Conduct.






















                    2












                    2








                    2







                    Slice a tomato with very little pressure. This is almost always when I notice a knife needs sharpening, and the difference is profound.






                    share|improve this answer








                    New contributor




                    Oscar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                    Check out our Code of Conduct.










                    Slice a tomato with very little pressure. This is almost always when I notice a knife needs sharpening, and the difference is profound.







                    share|improve this answer








                    New contributor




                    Oscar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                    Check out our Code of Conduct.









                    share|improve this answer



                    share|improve this answer






                    New contributor




                    Oscar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                    Check out our Code of Conduct.









                    answered 1 hour ago









                    OscarOscar

                    1211




                    1211




                    New contributor




                    Oscar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                    Check out our Code of Conduct.





                    New contributor





                    Oscar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                    Check out our Code of Conduct.






                    Oscar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                    Check out our Code of Conduct.





















                        1














                        You hold it edge up and then you let a silk scarf slowly float down over it. It should be cut neatly in half.






                        share|improve this answer


















                        • 4





                          Ah yes, let me just whip out one of my collection of silk scarves that I keep for just this occasion and - what the? Kevin Costner and/or Whitney Houston!? What are you doing here?

                          – MikeTheLiar
                          3 hours ago






                        • 2





                          @MikeTheLiar if you're not traveling with your juggling kit, you're not prepared for the outdoors.

                          – Sdarb
                          3 hours ago






                        • 2





                          Juggling scarves is for amateurs. I juggle the knives. I know they're sharp when I wake up in the hospital.

                          – Oscar
                          1 hour ago















                        1














                        You hold it edge up and then you let a silk scarf slowly float down over it. It should be cut neatly in half.






                        share|improve this answer


















                        • 4





                          Ah yes, let me just whip out one of my collection of silk scarves that I keep for just this occasion and - what the? Kevin Costner and/or Whitney Houston!? What are you doing here?

                          – MikeTheLiar
                          3 hours ago






                        • 2





                          @MikeTheLiar if you're not traveling with your juggling kit, you're not prepared for the outdoors.

                          – Sdarb
                          3 hours ago






                        • 2





                          Juggling scarves is for amateurs. I juggle the knives. I know they're sharp when I wake up in the hospital.

                          – Oscar
                          1 hour ago













                        1












                        1








                        1







                        You hold it edge up and then you let a silk scarf slowly float down over it. It should be cut neatly in half.






                        share|improve this answer













                        You hold it edge up and then you let a silk scarf slowly float down over it. It should be cut neatly in half.







                        share|improve this answer












                        share|improve this answer



                        share|improve this answer










                        answered 5 hours ago









                        Tomas ByTomas By

                        21313




                        21313







                        • 4





                          Ah yes, let me just whip out one of my collection of silk scarves that I keep for just this occasion and - what the? Kevin Costner and/or Whitney Houston!? What are you doing here?

                          – MikeTheLiar
                          3 hours ago






                        • 2





                          @MikeTheLiar if you're not traveling with your juggling kit, you're not prepared for the outdoors.

                          – Sdarb
                          3 hours ago






                        • 2





                          Juggling scarves is for amateurs. I juggle the knives. I know they're sharp when I wake up in the hospital.

                          – Oscar
                          1 hour ago












                        • 4





                          Ah yes, let me just whip out one of my collection of silk scarves that I keep for just this occasion and - what the? Kevin Costner and/or Whitney Houston!? What are you doing here?

                          – MikeTheLiar
                          3 hours ago






                        • 2





                          @MikeTheLiar if you're not traveling with your juggling kit, you're not prepared for the outdoors.

                          – Sdarb
                          3 hours ago






                        • 2





                          Juggling scarves is for amateurs. I juggle the knives. I know they're sharp when I wake up in the hospital.

                          – Oscar
                          1 hour ago







                        4




                        4





                        Ah yes, let me just whip out one of my collection of silk scarves that I keep for just this occasion and - what the? Kevin Costner and/or Whitney Houston!? What are you doing here?

                        – MikeTheLiar
                        3 hours ago





                        Ah yes, let me just whip out one of my collection of silk scarves that I keep for just this occasion and - what the? Kevin Costner and/or Whitney Houston!? What are you doing here?

                        – MikeTheLiar
                        3 hours ago




                        2




                        2





                        @MikeTheLiar if you're not traveling with your juggling kit, you're not prepared for the outdoors.

                        – Sdarb
                        3 hours ago





                        @MikeTheLiar if you're not traveling with your juggling kit, you're not prepared for the outdoors.

                        – Sdarb
                        3 hours ago




                        2




                        2





                        Juggling scarves is for amateurs. I juggle the knives. I know they're sharp when I wake up in the hospital.

                        – Oscar
                        1 hour ago





                        Juggling scarves is for amateurs. I juggle the knives. I know they're sharp when I wake up in the hospital.

                        – Oscar
                        1 hour ago











                        1














                        The best method in my opinion is one that must be learned, and involves moving your thumb across the blade, perpendicular to the blade not down it! It's very difficult to describe the feeling but if you do it on enough dull blades and sharp blades you will begin to be able to tell the difference.



                        One other thing I will do if im sharpening a knife for a friend or coworker to display how sharp it is is shave a couple hairs off the back of my hand. Lick your thumb, moisten the patch on the back of your hand and shave as you would with a straight razor. (You may want to wipe the knife clean after this.) Sounds weird but i do it because your average joe will know its extrememly sharp if you can shave with it and be careful with it.



                        One other test could be to attempt to very thinly slice a tomato, with and exceptionally sharp knife you should be able to get nearly paper thin slices with a light sawing motion.






                        share|improve this answer



























                          1














                          The best method in my opinion is one that must be learned, and involves moving your thumb across the blade, perpendicular to the blade not down it! It's very difficult to describe the feeling but if you do it on enough dull blades and sharp blades you will begin to be able to tell the difference.



                          One other thing I will do if im sharpening a knife for a friend or coworker to display how sharp it is is shave a couple hairs off the back of my hand. Lick your thumb, moisten the patch on the back of your hand and shave as you would with a straight razor. (You may want to wipe the knife clean after this.) Sounds weird but i do it because your average joe will know its extrememly sharp if you can shave with it and be careful with it.



                          One other test could be to attempt to very thinly slice a tomato, with and exceptionally sharp knife you should be able to get nearly paper thin slices with a light sawing motion.






                          share|improve this answer

























                            1












                            1








                            1







                            The best method in my opinion is one that must be learned, and involves moving your thumb across the blade, perpendicular to the blade not down it! It's very difficult to describe the feeling but if you do it on enough dull blades and sharp blades you will begin to be able to tell the difference.



                            One other thing I will do if im sharpening a knife for a friend or coworker to display how sharp it is is shave a couple hairs off the back of my hand. Lick your thumb, moisten the patch on the back of your hand and shave as you would with a straight razor. (You may want to wipe the knife clean after this.) Sounds weird but i do it because your average joe will know its extrememly sharp if you can shave with it and be careful with it.



                            One other test could be to attempt to very thinly slice a tomato, with and exceptionally sharp knife you should be able to get nearly paper thin slices with a light sawing motion.






                            share|improve this answer













                            The best method in my opinion is one that must be learned, and involves moving your thumb across the blade, perpendicular to the blade not down it! It's very difficult to describe the feeling but if you do it on enough dull blades and sharp blades you will begin to be able to tell the difference.



                            One other thing I will do if im sharpening a knife for a friend or coworker to display how sharp it is is shave a couple hairs off the back of my hand. Lick your thumb, moisten the patch on the back of your hand and shave as you would with a straight razor. (You may want to wipe the knife clean after this.) Sounds weird but i do it because your average joe will know its extrememly sharp if you can shave with it and be careful with it.



                            One other test could be to attempt to very thinly slice a tomato, with and exceptionally sharp knife you should be able to get nearly paper thin slices with a light sawing motion.







                            share|improve this answer












                            share|improve this answer



                            share|improve this answer










                            answered 1 hour ago









                            Nate WNate W

                            1,499617




                            1,499617





















                                0














                                the best test for if your knife is sharp enough is to place it in a stream with the water flowing over the blade. If your knife is sharp, leaves and fish that flow past it will be cut, but if it's the sharpest, then only leaves will be cut but fish will be okay.



                                source: https://en.wikipedia.org/wiki/Masamune#Legends_of_Masamune_and_Muramasa






                                share|improve this answer








                                New contributor




                                Sdarb is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                                Check out our Code of Conduct.















                                • 2





                                  -1 A legend is no answer.

                                  – Jan Doggen
                                  3 hours ago






                                • 1





                                  We're looking for stuff that works in the real world, not stuff that works in legends.

                                  – Mark
                                  2 hours ago















                                0














                                the best test for if your knife is sharp enough is to place it in a stream with the water flowing over the blade. If your knife is sharp, leaves and fish that flow past it will be cut, but if it's the sharpest, then only leaves will be cut but fish will be okay.



                                source: https://en.wikipedia.org/wiki/Masamune#Legends_of_Masamune_and_Muramasa






                                share|improve this answer








                                New contributor




                                Sdarb is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                                Check out our Code of Conduct.















                                • 2





                                  -1 A legend is no answer.

                                  – Jan Doggen
                                  3 hours ago






                                • 1





                                  We're looking for stuff that works in the real world, not stuff that works in legends.

                                  – Mark
                                  2 hours ago













                                0












                                0








                                0







                                the best test for if your knife is sharp enough is to place it in a stream with the water flowing over the blade. If your knife is sharp, leaves and fish that flow past it will be cut, but if it's the sharpest, then only leaves will be cut but fish will be okay.



                                source: https://en.wikipedia.org/wiki/Masamune#Legends_of_Masamune_and_Muramasa






                                share|improve this answer








                                New contributor




                                Sdarb is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                                Check out our Code of Conduct.










                                the best test for if your knife is sharp enough is to place it in a stream with the water flowing over the blade. If your knife is sharp, leaves and fish that flow past it will be cut, but if it's the sharpest, then only leaves will be cut but fish will be okay.



                                source: https://en.wikipedia.org/wiki/Masamune#Legends_of_Masamune_and_Muramasa







                                share|improve this answer








                                New contributor




                                Sdarb is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                                Check out our Code of Conduct.









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                                answered 4 hours ago









                                SdarbSdarb

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                                New contributor




                                Sdarb is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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                                New contributor





                                Sdarb is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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                                Sdarb is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                                Check out our Code of Conduct.







                                • 2





                                  -1 A legend is no answer.

                                  – Jan Doggen
                                  3 hours ago






                                • 1





                                  We're looking for stuff that works in the real world, not stuff that works in legends.

                                  – Mark
                                  2 hours ago












                                • 2





                                  -1 A legend is no answer.

                                  – Jan Doggen
                                  3 hours ago






                                • 1





                                  We're looking for stuff that works in the real world, not stuff that works in legends.

                                  – Mark
                                  2 hours ago







                                2




                                2





                                -1 A legend is no answer.

                                – Jan Doggen
                                3 hours ago





                                -1 A legend is no answer.

                                – Jan Doggen
                                3 hours ago




                                1




                                1





                                We're looking for stuff that works in the real world, not stuff that works in legends.

                                – Mark
                                2 hours ago





                                We're looking for stuff that works in the real world, not stuff that works in legends.

                                – Mark
                                2 hours ago

















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