Assertion: ash's bark | /r/ObjectUse | used as source
Facets:
value: for blue dye
type: PURPOSE
Source sentences:
text: The inner bark of the blue ash (F. quadrangulata) has been used as a source for blue dye.
text: The inner bark of the Blue Ash (Fraxinus quadrangulata) has been used as a source for a blue dye.