Assertion: magnesium carbonate | /r/ObjectUse | used as matte white coating
Facets:
value: for projection screens
type: PURPOSE
Source sentences:
text: In addition, magnesium carbonate is used as a matte white coating for projection screens.
text: In addition, magnesium carbonate is used as a matte white coating for projection screens.
text: In addition, magnesium carbonate is used as a matte white coating for projection screens.