Obsidian

Sold in 16oz pints

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

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

https://www.maycocolors.com/product/cg-786-obsidian/