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below PH1 it's red colour

from PH1-7 it's yellow ,and above PH 7 it turnes to red colour,

when it comes in contact of NaOH above PH7 charge of turmeric becomes negative ,1negative charge ,2 negative charge ,and in high ph about 11 it has 3negative charge on it's oxygen. ,and each mollecul repels each other and get a special demantional stracture in solution that absorb red light in whole light

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12y ago

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