Assertion: walnut's fruit | /r/CapableOf | cook strong deep black dye
Facets:
value: in an iron pot
type: LOCATION
Source sentences:
text: Like all walnuts, unripe fruit husks produce a strong yellow dye that does not require mordant; ripe fruits produce a strong red to brown dye that does not require a mordant, and if cooked in an iron pot, a strong deep black dye.