Indigo, an ancient dye, may have originated in the Peruvian Andes, according to new research. Earliest use found 6200 years ago.
Ancestral indigo cultivation and dying in the Rift Valley
Indigo dye used by South Americans in Peru long before the Egyptians
Early pre-Hispanic use of indigo blue in Peru
Why Made In Peru
Indigo Dye: A Shared Language in the Global South
From remote Laos to haute couture: A journey of indigo dye - CNA
The Super-Ancient Origins of Your Blue Jeans
A World of Blue
Origin of Indigo Dye in Peru – ayaecofashion
Women's Organic Pima Cotton Vest – Aya Eco Fashion EU
Indigo-dyed fabric - 100% cotton