Assertion: carbon black's carbon | /r/HasProperty | abbreviated to ac
Facets:
value: often
type: TEMPORAL
value: for general amorphous carbon
type: CAUSE
Source sentences:
text: Amorphous carbon is often abbreviated to aC for general amorphous carbon, aC:H or HAC for hydrogenated amorphous carbon, or to ta-C for tetrahedral amorphous carbon (also called diamond-like carbon).