Assertion: cobalt | /r/AtLocation | beer making formula
Facets:
value: by several north american brewers
type: OTHER
value: in the mid-1960s
type: TEMPORAL
Source sentences:
text: In the mid-1960s, Cobalt was added to a beer making formula by several North American brewers to stabilize foam.
text: In the mid-1960s, Cobalt was added to a beer making formula by several North American brewers to stabilize foam.