Assertion: titanium dioxide | /r/CapableOf | take 12–48 hours
Facets:
value: to absorb enough energy
type: PURPOSE
Source sentences:
text: Although the coating needs only a small amount of ultraviolet light for the photocatalytic effect to begin (so it works even on cloudy days), the titanium dioxide still takes 12–48 hours to absorb enough energy to work properly.