Cone 06 oxidation (large photo): Obsidian is an opaque black base glaze with variegated blue/green/brown crystals that melt.

Cone 6 oxidation (small photo): Base glaze remains – crystals fade completely. Enhanced mobility. Surface issues may occur.

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.