Assertion: bismuth | /r/CapableOf | produce black line
Facets:
value: due to bismuth sulfide
type: CAUSE
value: usually
type: TEMPORAL
value: along the gums
type: LOCATION
Source sentences:
text: Usually, bismuth produces a black line, due to bismuth sulfide, along the gums, near the teeth, similar to the Burton's line which can be found in lead poisoning.