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well some people believe turmeric is a base but
its an acid
Turmeric is yellow in acidic or neutral solutions but red to brown in a basic solution.
acidic
Turmeric is yellow in acidic and neutral solutions; in basic solutions turmeric is red to brown.
lime juice and soap solutions turn red in turmeric because turmeric is an organic indicator which turns red in acidic or basic solution and lime juice is an acidic solution while soap is a basic solution
I'd suggest (but couldn't establish it from literature) that turmeric powder is yellowish ocra in acidic 'solution', because it gives mustard (made with acetic acid) its yellow color, which is not redish-brown like curcuma is in neutral circumstance.Added:From one scource it says: ' In acidic solutions (pH 8.6) solutions it turns bright red.'
Turmeric is yellow in an acidic solution.
Curcuma (turmeric) is red in an alkaline solution and yellow in an acidic solution.
Turmeric is red in basic solutions.
common salt does not have much effect as it is a substance formed during the process of neutralization. thus it is neither acidic nor basic in nature.
Turmeric (curcumine) remain yellow in acidic solutions.
acidic acidic acidic
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.