How did the Crimean Tatars Dye Threads in the Old Days?

Crimean Tatar woven and embroidered products are known to have a variety of ornaments and colors. But how did our ancestors dye threads in different colors before the advent of synthetic dyes? Prepared based on the article by Polina Chepurina «Ornamental weaving of the Crimean Tatars», published in 1929.