HOW TO DO WHITEWASHING AND COLOUR WASHING
Preparation of Materials for White and Colour Washing
As
these paints are used for low-cost buildings, preparation of the surface is not
given much importance. Whitewashing is carried out using fat lime and colour washing is done by adding approved pigments to fat lime. Alternatively, colour washing powders consisting of readymade mixtures of fat lime and
colouring matter are also available in the market. For preparing whitewash,
thoroughly slaked fat lime is mixed with water and made into a thin cream.
This
is allowed to stand for a period of 24 hours after which it is screened through
a coarse cloth. For colour wash, it is advisable to buy the ready mixed coloured
paint material. If we are to mix the ingredients, we should thoroughly mix a sufficient quantity of the mix in one operation to avoid shade differences.
Some of the pigments used are ultramarine or indigo, copper sulphate (blue) and
yellow and red ochre. To the above basic
materials, we also add the following materials:
(a) One kg of gum dissolved in
hot water for each cubic metre of lime cream. (Alternately rice or kanji water
is added.)
(b) 1.3 kg of common salt
dissolved in hot water for every 10 kg of lime powder. (Salt quickens
carbonation of calcium hydroxide and makes the coating hard and resistant to
abrasion.)
(c) Indigo (Neel) up to 3 gm
per kg of lime used for the mix is usually added to make the paint.
The thoroughly mixed solution
prepared as indicated above is applied with a brush or a moonj, generally in
three coats to a new surface and two coats to an old surface.
Must read: Types
of Paint Used in Construction and Its Uses
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to do painting iron and steel with enamel paints?
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