Since handweaving is one of my hobbies, or was until my books took off and I no longer had time, I am fascinated by ancient textiles. Until modern times, and the Industrial Revolution when looms and weaving became mechanized, weaving was one of the most important professions. In Egypt, some of the hieroglyphics inscribed on walls show weavers. And loom weights have been found in Akrotiri, buried in ash when the volcano that blew the center out of Santorini and severely weakened the Minoan civilization erupted.
Working in tandem with the weavers were the dyers. Of course, until the 1880s when the synthetic dyes were invented, all the dyes were natural dyes. The women of Bronze Age Crete used dyes to create their elaborate and colorful patterned textiles.
Notice the colorful stripes on the figures loincloth in the restored fresco from Knossos.
What were the dyes they used? Yellow from saffron. (A famous fresco depicts a group of young girls collecting saffron from crocuses. Yellow was the color of the young girl.) Blue from indigo. Red from the cochineal beetle. And, perhaps most interested and valuable, purple from the shell of the murex sea snail. Thousands and thousands of shells have been found, speaking to a large operation. Because so many shells were needed to make the dye, purple was very expensive. Hence the name, royal purple. It was too expensive for the common folk, right up through the Middle Ages.
Where is green? Although green is all around us in nature, it is a very hard color to find as a dye. Using green plants does not usually give a green color and if it does, the color is not permanent.
Green usually has been made by dyeing blue and overdyeing yellow. When it was discovered by the painters, green contained arsenic. Napoleon is supposed to have died from arsenic poisoning from the fumes coming off his wallpaper.