Main Discussion Area > Flintknapping
Texas cobble
mullet:
What I picked up between Laredo and San Antone took about 350- 450, but be carefull not to get hotter.
Chippintuff:
I'm not a pro at heating, but I do heat a lot of my stone. I would saw or knap that into thinner pieces before heating it. As dark as that is (rootbeer?), I would take it up to 400-425 slowly and then hold it there for at least 12 hours. Every person heat treating rock will give you a different recipe. I doubt that rock can take more than 425 F, and then it needs to be thinned into slabs or preforms before heating.
WA
Tower:
I can't argue w/ them recipes . I use a turkey roaster & it's max temp works perfect. About 450 max at least 8 hrs. You'll love it.
mullet:
I was supprised that I blew some up heating it with coral at the same time. Usually I crank coral to 450 and let it go all night.
Chippintuff:
Did you hold it at 200 for 12-24 hrs to be sure to get all the moisture out before you took it above boiling? Did you work it down to thin pieces by sawing or making preforms before heating? Did you ramp the heat up slowly at no more than 60 F per hour? Did you make sure the cool down was no faster than about 50 F per hour? If you fail to do any of these precautions, you can get busted rock. Back when I was learning how to heat treat I was using a ceramic kiln. I destroyed a lot of rock by violating all the above precautions. I have opened the kiln and found a pile of sand instead of knappable stone.
WA
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