Whitewash, or calcimine, kalsomine, or calsomine is a very low cost type of paint made from slaked lime (calcium hydroxide) and chalk (whiting). Various other additives have also been used. Whitewash Whitewash cures through a reaction with carbon dioxide in the atmosphere to form calcium carbonate in the form of calcite, a reaction known as carbonatation. When the paint initially dries it's uncured, and has almost no strength. It takes up to a few days, depending on climate, to harden. It is… (More on Whitewash)