Natural Dyeing Resources

Indigo Extraction
Extraction: Biology, Chemistry and Methods, Honey Hill Studios
Graham Keegan (I Grew Some Indigo)
Ecotone Threads (indigo processing)

The Art and Science of Natural Dyes
Joy Boutrup and Catharine Ellis

Wild Color
Jenny Dean

Singing the Blues
John Marshall

The Art and Craft of Natural Dyeing
J.N. Liles

Botanical Inks
Babs Behan

Glossary of Dyeing Terms - Wikipedia
Aluminum Potassium Sulfate Data Sheet