Bone Ash 1/2 lb

Bone Ash (Di-Calcium Phosphate) Ca3(PO4)2 CaCO3 8 oz bag. Bone Ash is an excellent seal for seams and cracks in refractory lining. So, if you spill molten metal on your kiln and eat a hole in it, simply fill the hole with bone ash and continue to use your kiln. Bone ash is safe, clean, odorless, smokeless and has no dust build-up during processing.