Okay, we got the paper, we got the pens and brushes—now we need the medium: ink.
Medium (singular), media (plural) are Latin words.
Medium is the word we artists use when we talk about the substance used to make marks—ink, paint, crayon, pencil, pastel, chalk. Every medium needs 2 parts: pigment and binder. The pigment is the color. You get pigment from vegetable, animal, or mineral sources. The binder is what holds the pigment together and makes it stick to a surface like paper. Liquid medium needs a third part: solvent.
To get black pigment, the Egyptians used the same stuff they did in pre-historic times: burned bones. When bones burn they turn black and brittle. The scribes ground them into a powder. You can use charcoal from wood, too.
To hold the powder together, they used the sap from the acacia tree. It’s called Gum Arabic and is still used in watercolor today. Gum Arabic is water-soluble. The Egyptian scribes would dry out the gum, grind it into a powder, mix it with burnt-bone powder and add water. They might add very little water to make a thick paste which they could form into a cake.
After the cake dried, a scribe could carry it around with him and reactivate the ink by adding a bit of water with his brush. Water is the solvent. If you’ve painted with a box of pan watercolors you understand what I mean. The scribe wrote on the papyrus with brush or pen and when the ink dried the pigment stayed there for thousands of years.
When they’re exposed to water and air, metals oxidize or corrode. As they do, they produce a colored outer layer. The Egyptians got red pigment by scraping the rust from iron. They got green or blue by scraping the corrosion off of copper.
The egyptologist in this article says ‘infers’ but he means ‘implies:’
This book is a must-read if you’re interested in color:
Back to the beginning of The Western Civ User’s Guide to Reading & Writing.