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Friday, April 29, 2022

HOW TO DO WHITEWASHING AND COLOUR WASHING - HOMESLIBRO

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.


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