Assertion: glass | /r/HasProperty | polished
Facets:
value: for high quality flat glass
type: CAUSE
Source sentences:
text: Even this glass was of nonuniform thickness and had some roughness at its surface, therefore, for high quality flat glass, it had to be ground and polished.
text: Whether it's rough where the glass making rod was broken off, just a polished bump, or smoothed out to form an oval or round indention, blown glass will have some type of pontil mark present.