Real henna is never jet black. Black henna that stains fast usually contains PPD, which can cause burns, scarring and lifelong allergy. How to stay safe.
Is henna safe? Natural henna is safe for most skin. The real risks are black henna and PPD, rare allergies and G6PD in babies. Plus how to patch test.
A balanced review of henna hair side effects. Pure henna is mostly safe but can dry or stiffen hair; the real danger is compound and black hennas with PPD.