Question
Mon June 27, 2011 By:

Why do walls shine some days after white washing?

Expert Reply
Mon June 27, 2011
In whitewash Calcium hydroxide is present.Calcium hydroxide reacts slowly with the carbon dioxide in air to form a thin layer of calcium carbonate on the walls. Calcium carbonate is formed after two to three days of white washing and gives a shiny finish to the walls.
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