White washing is the oldest method of surface finishing in use. The white-washing material is prepared from pure fat lime, which may be slaked at site. Slaking is carried out in a tub until the mixture shows a creamy consistency. The slaked lime is allowed to rest for 24–48 hours. The mixture is then strained through a coarse cloth. Three kilograms of gum boiled with 10 kilogram of rice are added to each cubic metre of the slaked lime.
The completed white-washed surface shall form an opaque coat of white colour. It also presents a smooth regular surface free from any powdery matter.
Colour washing is prepared by the addition of the necessary pigment to the pure slaked fat lime and mixed thoroughly. Then it is screened through a clean and fine cloth. During the time of application it is continuously stirred with a stick. To get uniformity, an adequate quantity should be mixed. Colour should not crack or come off readily on the fingers when rubbed.
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