Mike Campbell has certainly done his good deed for the day in clarifying and correcting the mistakes in the recipies presented here. Doug Mann has done likewise in recommending the use of a full face shield, welders gloves, and heavy sweatshirt. This stuff is quite dangerous and capable of putting a careless user in the burn unit, or frying an eyeball and ending your shooting days. When reheating a potassium nitrate pot, the salts can melt on the bottom and erupt through the crust that formed after cooling from the last use. Drilling a few holes with an old 3/8" drill bit into the solidified pot before reheating has prevented this for me. I recall that Brownells Gunsmith Kinks has a tip suggesting leaving a long bolt in the still molten bath as it cools, and then unscrewing it before reheating.