Assertion: henna's chemical | /r/HasProperty | essential oils
Facets:
value: in one report
type: LOCATION
Source sentences:
text: In nearly all cases, the allergen in black henna tattoos was PPD (or similar dyes that cross‐react with PPD and are identified by a positive patch test reaction to PPD); in one report, the incriminated chemicals were essential oils [‘pink oil’ and cedarwood oil; presence in the tattoo not verified 169].