Assertion: patchouli's oil | /r/HasProperty | treated
Facets:
Source sentences:
text: While Patchouli essential oil is often specifically distilled using metal stills to ensure the warm, dark color in the final product, the perfume industry considers this type of Patchouli undesirable because it has a disastrous effect on the stability of perfumes, causing discoloration of the end product2; instead the oil is treated to remove the iron coloring and is thereafter referred to as iron-free.