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whitewash
Whitewash, or calcimine, kalsomine, calsomine, or lime paint is a low-cost type of paint made from slaked lime (calcium hydroxide, Ca(OH)2) and chalk (calcium carbonate, (CaCO3), sometimes known as "whiting". Various other additives are also 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 carbonation.
It is usually applied to exteriors; however, it is traditionally used for interiors in food preparation areas, particularly rural dairies, for its mildly antibacterial properties. Occasionally it is coloured and used on structures such as the hallways of apartment buildings, but it is not popular for this as it can rub off onto clothing to a small degree. In Britain and Ireland, whitewash was used historically, both externally and internally, in workers' cottages, and still retains something of this association with rural poverty. In the United States, a similar attitude is expressed in the old saying: "Too proud to whitewash and too poor to paint", with the connotation that whitewash is a cheap imitation of "real" paint.
Whitewash is especially effective on adobe-like materials because it is absorbed easily and the resultant chemical reaction hardens the medium. Also, whitewash and adobe are both very low cost building materials.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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