Assertion: cobalt | /r/ObjectUse | used as pigment
Facets:
value: from the 13th century
type: TEMPORAL
value: in central asia
type: LOCATION
value: as in ancient times
type: TEMPORAL
value: predominantly
type: DEGREE
Source sentences:
text: Before the 19th century, cobalt was predominantly used as a pigment.
text: As in ancient times, cobalt is still used in pigments today.
text: Cobalt was used as a pigment in Central Asia from the 13th century.
text: Though still used in pigments, cobalt plays a variety of roles in modern technology.