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The charcoal would be dust and then mixed with animal fat to make the pigment.
One most amazing discovery was found at the Chauvet Pont d’Arc Cave, in Southern France. Tiny bits of charcoal found in this cave and providing new clues into how our prehistoric ancestors lived, some 35,000 years ago!
They began by using charcoal, and then made more vivid black pigments by burning bones or grinding a powder of manganese oxide.
Different charcoal pigments were made by burning different woods and animal products, each of which produced a different tone.
Also used as dye for fabrics, and in some societies for making tattoos.
The first black was carbon easy to made out of charcoal.
A story about colour origination would be unfinished if I had left black outside. It is the total absorption of visible light as it is explained in Wikipedia and science books.
If you’re an artist and you want to create a dark blackish hue, you have to mix amounts of all primary colours (red, yellow and blue) in order to create a very dark tending to black hue.
The powdered charcoal was then mixed with gum arabic or the yellow of an egg to make a paint.
Different civilizations burned different plants to produce their charcoal pigments.