It is known from classical times and it is made by collecting soot from oil lamps. Slightly bluish in color, it makes good neutral grays when mixed with white.
Manufacturer / product code: Kremer / 47250
Chemical description: amorphous carbon black made from condensed smoke of burning mineral oil, tar, pitch or resin. Kremer PDF
Color Index: PBk7
More info: Pigments Through The Ages
DOWNLOAD paper: “Pigments Checker version 3.0, a handy set for conservation scientists: A free online Raman spectra database”
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