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Knife handles made from milk ''rock''

I am thinking of making a knife handle out of almost rock hard material that is made from milk by adding some vinegar in it and the drying it. Is it a good idea or will it just break when i hit something with the knife? Should I just rely on wood and make the handle from it?

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Well, it's kind of strong when it's thick, but unfortunately it is brittle. One medium hard whack with a hammer or a hard drop on concrete and it shatters. :/
There are more complicated recipes that add specific kinds of silicate clays that reduce the brittle flaw, but from what I can see the process is convoluted. I think they're still working on it to make a new biodegradable plastic.
Oh, and that's maybe another side effect to keep in mind -- the basic milk/vinegar recipe biodegrades fast.
I wouldn't use it for a knife handle, at least not any with an actual sharp blade. Too many hazardous "what ifs" that could backfire on you.
However... A really ornate molded Sheath for the knife made out of milk plastic?? That could be cool!
Look up milk plastic jewelry links for some sculpting and molding tips.
You could match it with white or patterned wood knife handle as a set?
Anyway, I'm thinking that's a better way to go. :)

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Wouldn't it smell?

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No, it doesn't smell.
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rely on wood
that should work

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