PV Clay or Plastic Vitrox Clay is a mineral made of clay, mica, feldspar, and silica used in clay and glaze recipes. It has high silica content, casting proerties, low iron, long firing range, and low loss on ignition. This material will vitrify around cone 6 but turn white closer to cone 10. Its color and working properties have made people describe it as "nature's pure porcelain".
The original 50# bag is light tan and says PRO-TECH (no markings to identify that it's PV Clay or Plastic Vitrox)
