Frankfort black

English

Noun

Frankfort black (uncountable)

A black pigment formerly used in copperplate printing, prepared by burning vine twigs, the lees of wine, etc.
- 1735, John Barrow, Dictionarium Polygraphicum:
  German or Frankfort BLACK, is made of the lees of wine burnt , then wash'd ' in water and ground in mills […]

References

“Frankfort black”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.

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