411 REFERENCE · Wiktionary
Frankfort black
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Noun
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A black pigment formerly used in copperplate printing, prepared by burning vine twigs, the lees of wine, etc.
German or Frankfort BLACK, is made of the lees of wine burnt , then wash'd ' in water and ground in mills
References