Assertion: alkaptonuria's urine | /r/CapableOf | become dark brown
Facets:
value: after getting exposed to air
type: TEMPORAL
Source sentences:
text: Urine becomes dark brown or black after getting exposed to air.
text: if you notice that your own urine or your child's urine becomes dark brown or black when it is exposed to air.
text: if you notice that your own urine or your child's urine becomes dark brown or black when it is exposed to air.