This chemical is also in powdery form. It is packaged in bags and they write CalCo on it. It is made by so many companies, I would not like to advertise any but just ask of calcium and it will be given to you. Now calcium carbonate is of two or types
We have delomite and cacite. Both are good but delomite is recommended if you are producing pure white paint and cacite is better in off white (dirty white) paint.