Assertion: mustard | /r/AtLocation | ball
Facets:
value: till mrs. clements, of durham
type: OTHER
value: on july
type: TEMPORAL
Source sentences:
text: It was sold in balls till Mrs. Clements, of Durham, on July 10, 1720*, invented the method of preparing mustard flour or powder, which long went under the name of ‘Durham Mustard’.