Assertion: zircon's index | /r/CapableOf | ensure its use
Facets:
value: as an opacifier
type: MANNER
Source sentences:
text: Its high refractive index ensures its use as an opacifier (a substance added to a material to increase opacity) thereby greatly increasing the whiteness and brightness of the tile, while its hardness and chemical resistance ensures that ceramics are resistant to scratching and chemical damage.