Black Diamond Astro Gem (AS-512)
Astro Gems™ are an underglaze-based textural glaze that contains tiny crystals. When fired, Astro Gem™ crystals provide jewel-like spots on the matte surface of the glaze. May be applied to both green-ware and bisque.
Cone 06: Black Diamond is a black matte underglaze base with small black crystals that fire glossy.
Comes in a 4oz jar.