Assertion: henna's chemical | /r/HasProperty | black henna
Facets:
value: aka
type: OTHER
Source sentences:
text: The biggest drawback is perhaps the proliferation of a chemical called paraphenylenediamine (PPD), aka "black henna.
text: Because it's made up of so many chemicals, including p-Phenylenediamine or PPD, black henna can actually cause chemical burns to occur, which unfortunately is what happened in Teigan's case.