Licence: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)
Credit: P-phenylenediamine reaction from a henna tattoo. Source: Wellcome Collection.
Licence: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)
Credit: P-phenylenediamine reaction from a henna tattoo. Source: Wellcome Collection.