Mayco’s Jungle Gems are gloss glaze bases with pieces of glass frit that melt during the firing process. As the crystals bloom, they produce dramatic, colorful effects. It's “Art in a Jar”. For mid-range fire artists, the crystal glazes maintain their color with increased crystal movement at the higher temperature. Reformulated, Jungle Gems join Crystalites in being non-toxic, safe for use by artists of all ages.