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Background
Henna has a very low allergic potential, and severe allergenic contact dermatitis is mainly caused by p‐phenylenediamine (PPD), which is added to temporary black ‘henna tattoos’, and potentially also by some heavy metals.
Objective
To determine the presence of, and quantify, Lawsone, PPD and heavy metal contaminants (cobalt, nickel, lead, and chromium) in commercial temporary black henna...
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