Assertion: pottery's colour | /r/CapableOf | penetrate opaque glaze
Facets:
Source sentences:
text: In the sixteenth century, the use of subtle and blended colours which were not strong enough to penetrate the opaque glaze made the delicate control of tonal values possible, and the painting therefore had to be done on the glaze surface, which then becomes a common manner of painting on tin-glazed wares.