Henna contain lawsone pigment that attaches to the proteins of the skin,hair,etc.But after a few weeks the color fades?
How does the color fade?
Is the pigment volatile or it is degraded by the body?
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It doesn't become volatile nor is it degraded. Neither is really possible because the dye (lawsone) forms very strong bonds with protein molecules and also penetrates the skin quite well [source: here].