Why does a vegetable stain turn reddish brown when washed with soap solutions
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Cooked vegetables or vegetable curry contain turmeric powder and soap is basic in nature. Turmeric is a natural indicator which changes its yellow colour into reddish brown when it comes in contact with a solution of base. Hence, when soap (which is basic in nature) is scrubbed on the stain, the stain turns red.
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Answer: Hope this helps. :)
If the vegetable is cooked as a curry it may contain turmeric powder which is a natural indicator that changes from yellow to reddish-brown when in contact with a base. As soap is naturally a base when scrubbed on the stain, the stain turns red.
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