Cone 06: Smoke and Fire is a translucent gray base glaze with white and orange crystals that melt/bloom and cobalt blue specks. Base glaze fades – crystals fade and melt. Enhanced mobility. Jungle Gems™ Crystal Glazes transform in the kiln when the small pieces of glass frit burst into color and intricate patterns during the firing process. Artists use these beautiful glazes to add dramatic, colorful effects to their creations.