An example of how organic natural dyes are extracted.
I have included a few pictures. Follow the link above to view the original post.
Indigofera tinctoria bears the common name True indigo. The plant was one of the original sources of indigo dye.
True indigo is a shrub one to two meters high. Dye is obtained from the processing of the plant's leaves. They are soaked in water and fermented in order to convert the glycoside indican naturally present in the plant to the blue dye indigotin. The precipitate from the fermented leaf solution is mixed with a strong base such as lye, pressed into cakes, dried, and powdered. The powder is then mixed with various other substances to produce different shades of blue and purple.
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