Here are the resources and links I recommend if you want to learn more about indigo or fibers:

DYEING WITH INDIGO

• Maiwa

• Wild Colours

• Natural Dye Workshop with Michel Garcia

• Indigo: Cultivate, dye, create by Douglas Luhanko and Kerstin Neumüller

• Singing The Blues: Soulful Dyeing for All Eternity by John Marshall

HISTORY OF INDIGO

• Indigo: Egyptian Mummies to Blue Jeans by Jenny Balfour-Paul

HISTORY OF COTTON

• Empire of Cotton: A Global History by Sven Beckert