Discussion
The plant dye Henna imparts orangered colour to skin and hairs due to its reaction with which of the following?
Answer: A
Henna colours skin and hair by reacting with protein and amino acids.
Its dye, lawsone, binds to the keratin of skin and hair, which is why the colour is fast on those tissues but washes off anything else. The reaction is with the amino groups of the protein.
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