Assertion: murex dye | /r/HasProperty | expensive – one snail yields
Facets:
value: fabulously
type: MANNER
Source sentences:
text: Murex dyes were fabulously expensive – one snail yields but a single drop of dye – and the Roman Empire imposed a strict monopoly on their use from the reign of Alexander Severus (AD 225–235) that was maintained by the succeeding Byzantine Empire until the Early Middle Ages.