Assertion: bronze | /r/HasProperty | exposed to air
Facets:
value: over time
type: TEMPORAL
Source sentences:
text: Bronze will oxidize when exposed to air, developing a patina coating.
text: Verdigris is the common name for a green pigment obtained through the application of acetic acid to copper plates or the natural patina formed when copper, brass or bronze is weathered and exposed to air or seawater over time.