Assertion: brass | /r/HasProperty | exposed to the oxygen
Facets:
value: with regular use
type: OTHER
value: in the air
type: LOCATION
value: with handling
type: CAUSE
Source sentences:
text: With regular use and handling, the brass itself is exposed to the oxygen in the air, and oxidation occurs which results in a tarnish or patina on the surface of the brass that keeps it from looking clean and bright.