Volc Frit

I just got a few free bags of volcanic frit from a potter in Richfield, about 10 minutes from my studio. 150lbs in all, so I hope with some testing I'll get it working for some cone 10 glazing. As I had no idea what the composition of the stuff was, I called the company on the bag, Calvert Corporation in Norton, KS, and thankfully they were still in business. They provided me a chemical analysis and melting point, so that should help, and also that it's very fine meshed material compared to what they've been screening these days. Later.