Tiny crystals mixed with a speckled base melt and move during firing, allowing the colours to bloom for beautiful, unique results. Safe for younger students - all colours are non-toxic. Cone 06. AP non-toxic. Pint. Create unique and dramatic effects with Sax True Fow Crystal Magic glazes. Tiny crystals within a speckled base melt and move during firing. Every firing will produce stunning, one-of-a-kind results. Certified non-toxic and lead-free.