Biology, asked by nittalapadma3421, 11 months ago

Which oil application to henna colored hair hives black color?

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Answered by kartikkalra
2
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Para-phenylenediamine, or a close chemical variant of para-phenylenediamine is in virtually every chemical hair dye, even most hair dyes which claim to be natural. There is now an epidemic of sensitization (allergic reaction) to this chemical because of over-exposure. The allergic reactions can be severe and require hospitalization. Long term effects of exposure to this chemical include lupus, asthma, non-Hodgkins lymphoma, and there appear to also be links to breast, uterine and bladder cancer.

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