PA24 recommended adding pieces of hoof to the pack, on the edges of the crucible. This might serve the same function as the ivory or teeth.

My own tests have been unsuccessful, I'm getting unacceptable scaling, but with small patches of nice color. Since I've been making my own charcoal I suspect it hasn't been cooked completely, causing the contamination. On one test I had sealed the crucible with hearth cement, but during the heat I heard a "pop", and when I opened the kiln there were flames coming out of the crucible along the edge seam of the lid. I've ordered charcoal from Brownell's to see if I'm right. Anyone have any insights?

Regards
Ken

Last edited by Ken61; 12/09/16 11:13 AM.
I prefer wood to plastic, leather to nylon, waxed cotton to Gore-Tex, and split bamboo to graphite.