when turmeric poder reacts with soap it turns red not other colors why?

it is because the turmeric contains a compound called cucumine.cucumine reacts with the fatty acid in the soap/detergent and thence the color of the combination changes to red. turmeric powder will not turn red with othe colours because of the absence of fatty acid.

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 turmeric powder is a natural indicator.Soap is basic in nature, A basic solution reacts with turmeric powder its colour changes to red.  So the turmeric powder reacts with soap and that turns red in colour.

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