Assertion: carbon black | /r/ObjectUse | used as printing ink
Facets:
value: widely
type: DEGREE
Source sentences:
text: As early as 1864, carbon black was used as a printing ink and it is still employed in this sector in the late 1990s.
text: Carbon black is also an excellent coloring agent as black pigment, and therefore is widely used for printing inks, resin coloring, paints, and toners.