If you're aiming for a deep, luxurious shade of black, look no further than Mastodon. This clay fires to a striking black color in both reduction and oxidation atmospheres. It has course grog and is manganese-free. 
 
*For best results, fire this clay to cone 6 with a thirty minute hold, or fire to cone 7.
High Fire Cone 6-7
Avg. Shrinkage 2±%: 9%
Avg. Absorption 1±%: 1.8%