Product Overview
Aardvark Clay's Obsidian (formerly Cassius Basaltic - boxes might have the old name on them as they transition)
Fired Shrinkage is 14.5% and Water Absorption is .5% when fired to cone 5. Very black, ebony like finish. Needs lots of oxygen during bisque firing.
Please refer to this link for a bisque firing schedule that was created with Obsidian in mind. https://www.aardvarkclay.com/pdf/technical/Bisquefiring.pdf
ā WARNING - This product can expose you to crystalline silica (quartz) which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov
