Assertion: calcium oxide | /r/CapableOf | appear with yellowish or brownish tint
Facets:
value: often
type: TEMPORAL
value: to the presence of impurities
type: CAUSE
Source sentences:
text: It often appears with a yellowish or brownish tint to the presence of impurities, especially iron.
text: It often appears with a yellowish or brownish tint to the presence of impurities, especially iron.