Paleoarts
Interfector Viris Spurii
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it don't mean a thing if you aint got that sling!
Posts: 1993
oceanside, CA
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certain types of knappable stone benefit from heat treatment and others don't. obsidian, for example, is the closest thing to glass there is and isn't really affected by heat treatment (it doesn't need it, either). novaculite is a chalkier, softer stone that, when treated, becomes more homogeneous and easier to work. it flakes better and doesn't shatter as easily. many modern knappers heat treat stone in small kilns, but the traditional way is to lay down a bed of sand, place your spalls on it and cover with more sand, then slowly build a fire on top distributing the coals evenly. you have to wait until the fire is completely out and the stones are back to air temp before you uncover them or they might crack. many types of stone undergo some wild color changes in this proccess. archeaologist have found heat treated stone going back tens of thousands of years so this isn't anything new.
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