Assertion: radium dial | /r/CapableOf | produce light
Facets:
value: no longer
type: TEMPORAL
Source sentences:
text: Although old radium dials may no longer produce light, this is frequently due to the breakdown of the crystal structure of zinc sulfide rather than the radioactive decay of the radium, which has a half-life of about 1600 years, so even very old radium dials remain radioactive.