The whitewash on buildings turns yellow with time. How does mixing indigo in lime before whitewashing help to keep the building white for a longer time?
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Answer: Whitewash is a very low cost type of paint made from slaked lime (calcium hydroxide) and chalk (whiting). ... Slaked lime turns into chalk by reacting with carbon dioxide in the air over several days. This causes crystallization, which binds and strengthens the coating
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