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this is truly a colorful experiment. when two chemicls are mixed it brings about a change
in color. you require Phenolphthalein which is a known "indicator" and also Calcium Hydroxide.
both are a white powders. Put a pinch of Calcium Hydroxide and Phenolphthalein on your hand.
Then rub both your palms together. you will be surprised that the two powders become red,
almost crimson. there is a chemical reaction going on. it is also exploited by some unscrupulous
people for showing magic.