Assertion: bluestone | /r/HasProperty | etched by acidic material
Facets:
value: immediately
type: MANNER
value: on contact
type: LOCATION
Source sentences:
text: Bluestone is immediately etched by any acidic material on contact, which is one of the reasons behind the popularity of the honed (matt) look bluestone, as it doesn't show the matt etch marks as much as polished Bluestone.