Assertion: bronze's copper | /r/HasProperty | exposed to air
Facets:
value: over time
type: TEMPORAL
Source sentences:
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.
text: Pure copper is orange-red and acquires a reddish tarnish when exposed to air.