Assertion: pure acetylene | /r/MadeOf | traces of phosphine
Facets:
value: usually
type: TEMPORAL
Source sentences:
text: Pure acetylene is a colourless gas with a pleasant odour; as prepared from calcium carbide it usually contains traces of phosphine that cause an unpleasant garliclike odour.
text: Pure acetylene is a colourless gas with a pleasant odour; as prepared from calcium carbide it usually contains traces of phosphine that cause an unpleasant garliclike odour.