Evidence of henna body art must be based on directly observing henna’s characteristics, and extending these observations into the past, to that which we cannot directly observe. We observe that henna leaves a rusty-red stain on skin. Henna’s dye is lawsone, the red-orange dye molecule. Lawsone stains skin and other keratin. The initial stain is orange, and that may oxidize to dark red, to brown, and nearly black. Human skin is presumably the same now as it was 8,000 years ago. The henna plant and its lawsone molecule are presumably the same now as it was 8,000 years ago. If henna leaves a brick colored stain on hands and feet now, henna should have left a brick colored stain on hands and feet consistently since the late Neolithic.
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