Is it bone or is it not
- OLDE CUTLER
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Is it bone or is it not
I learned something interesting yesterday that relates to the frequent question asked here on AAPK, are those handle slabs on my old knife bone or not? A fellow was telling me how he learned this from an old guy that collected knives for decades. It is a static electricity test. The way I tested this at home today to see if it works is like this. As you can see in my photo I had an orange piece of paper so things would be more easily visible, then I tore some pieces of tissue paper into tiny pieces (make sure your hands are clean and dry before doing this). Then I took a knife that I knew to be of composition (not bone) material and stroked it against the back of our cat Sophie. This built up a static charge on the handle material of the knife. I then carefully brought the knife down toward the pieces of tissue paper WITHOUT TOUCHING THEM and WOW, some of the pieces jumped up and stuck to the knife handle.Everyone who has animals in the house is familiar with the static charge that builds up when you stroke them, especially during the drier winter months indoors. Bone handles will not accumulate a static charge like synthetics will and it is this principle that makes this work. I would be interested in seeing what results others of you who are reading this get when you try it.
"Sometimes even the blind chicken finds corn"
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Re: Is it bone or is it not
Very neat ! I will give it a try when time permits and see what happens.
kj
kj
- jerryd6818
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Re: Is it bone or is it not
It's a lot easier for me to pick up my 45X microscope and just look. Cost me 2 bucks on ebay.
BUT if you don't have your microscope with you or don't have one, that sounds like a nifty low tech way to differentiate between bone and synthetic.
BUT if you don't have your microscope with you or don't have one, that sounds like a nifty low tech way to differentiate between bone and synthetic.
Forged on the anvil of discipline.
The Few. The Proud.
Jerry D.
This country has become more about sub-groups than about it's unity as a nation.
"The #72 pattern has got to be pretty close to the perfect knife."
--T.J. Murphy 2012
The Few. The Proud.
Jerry D.
This country has become more about sub-groups than about it's unity as a nation.
"The #72 pattern has got to be pretty close to the perfect knife."
--T.J. Murphy 2012
Re: Is it bone or is it not
Thanks for posting this info, a very useful tip.
- tongueriver
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Re: Is it bone or is it not
I don't have a cat but I have an old woman here; would that work?
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Re: Is it bone or is it not
Thanks. Wool and Silk will do it too.
- OLDE CUTLER
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Re: Is it bone or is it not
I would certainly give it a try, Cal. Your results may vary.tongueriver wrote: ↑Sun Mar 21, 2021 8:28 pm I don't have a cat but I have an old woman here; would that work?
"Sometimes even the blind chicken finds corn"
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Re: Is it bone or is it not
Jerry, that is a lot cheaper than having to maintain a cat. loljerryd6818 wrote: ↑Sun Mar 21, 2021 6:59 pm It's a lot easier for me to pick up my 45X microscope and just look. Cost me 2 bucks on ebay.
45x microscope - Labeled.jpg
Comparison Bone (haversian canals) vs Delrin.JPG
BUT if you don't have your microscope with you or don't have one, that sounds like a nifty low tech way to differentiate between bone and synthetic.
"Sometimes even the blind chicken finds corn"
Re: Is it bone or is it not
Or an "Old Woman"
- jerryd6818
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Re: Is it bone or is it not
: You guys crack me up.
Forged on the anvil of discipline.
The Few. The Proud.
Jerry D.
This country has become more about sub-groups than about it's unity as a nation.
"The #72 pattern has got to be pretty close to the perfect knife."
--T.J. Murphy 2012
The Few. The Proud.
Jerry D.
This country has become more about sub-groups than about it's unity as a nation.
"The #72 pattern has got to be pretty close to the perfect knife."
--T.J. Murphy 2012
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Re: Is it bone or is it not
In my line of work static charges can be either a blessing or a curse. If I am laying down gold or silver leaf I pick it up by using a "gilder's tip"which is a squirrel hair brush about 3 inches wide but very thin.I rub the bristles across my hair to build up a charge and then carefully lift up the leaf out of the book it comes in and very carefully lay it on the glued surface. I then smooth it out with a cotton ball.The leaf sticks wherever the adhesive is and rubs off where it is not.
However if I am doing art work on a plastic surface(fiberglass;ABS;etc.)after I clean the surface I have to go back over it with a damp paper towel to de-static the surface.Otherwise when I go to lay down the paint with a brush the static draws the paint off the brush hairs and deposits them exactly where I DON'T want paint;much like the OP's pieces of tissue.
Bone is usually pretty easily discerned by looking for the Haversian canals but some smooth bone can be deceiving.The static test will definitely be an asset on that type of bone.
However if I am doing art work on a plastic surface(fiberglass;ABS;etc.)after I clean the surface I have to go back over it with a damp paper towel to de-static the surface.Otherwise when I go to lay down the paint with a brush the static draws the paint off the brush hairs and deposits them exactly where I DON'T want paint;much like the OP's pieces of tissue.
Bone is usually pretty easily discerned by looking for the Haversian canals but some smooth bone can be deceiving.The static test will definitely be an asset on that type of bone.
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- Papa Bones
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Re: Is it bone or is it not
Yep, works like a charm. They also make a 60X. I think it was $5.95jerryd6818 wrote: ↑Sun Mar 21, 2021 6:59 pm It's a lot easier for me to pick up my 45X microscope and just look. Cost me 2 bucks on ebay.
45x microscope - Labeled.jpg
Comparison Bone (haversian canals) vs Delrin.JPG
BUT if you don't have your microscope with you or don't have one, that sounds like a nifty low tech way to differentiate between bone and synthetic.
Sometimes I Sit and Think .... Other times I just Sit
I May Grow Older, But I refuse to Grow Up!!
I'll sharpen it for you, but I don't give out band-aids!!
Smitty
I May Grow Older, But I refuse to Grow Up!!
I'll sharpen it for you, but I don't give out band-aids!!
Smitty