Assertion: ivory's use | /r/HasProperty | allowed in early 14th century
Facets:
Source sentences:
text: In the early part of the period mainly black paint and clear or brightly coloured glass was used, but in the early 14th century the use of compounds of silver, painted on glass which was then fired, allowed a number of variations of colour, centred on yellows, to be used with clear glass in a single piece.