Want to check out these books?
Adrosko, Rita J, and Margaret Smith Furry. Natural Dyes and Home Dyeing (Formerly Titled: Natural Dyes in the United States).
Boutrup, Joy, and Catharine Ellis. The Art and Science of Natural Dyes : Principles, Experiments, and Results.
Storey, Joyce. The Thames and Hudson Manual of Dyes and Fabrics. Thames and Hudson