Calcium Carbonate (whiting) is a carbonate of lime. CaCo3. A stable and insoluable (in water) compound of calcium which is used to introduce the oxide calcia (CaO) into clay bodies and glazes. Calcium Carbonate is the chemical name. The potter's materials which are almost pure calcium carbonate are whiting, limestone, marble, and chalk. p. 44, The Potter's Dictionary of Materials and Techniques, 1st Ed. by Frank Hamer
The full bag from the manufacturer is a 50# bag; white bag, black text Marblewhite
Available by the pound or in full bag quantities for best pricing
CoA for April 2023 restock: