Whiting Powder is used in the preparation of etching plates. It is made of ground calcium carbonate chalk and free from impurities.
Mix Whiting Powder with water to create a paste to degrease copper or zinc plates before applying ground or aquatinting. To remove tarnishes from plates, mix whiting powder with ammonia.
Whiting Powder can also be added to your etching inks to stiffen and increase body.