Tokushima is one of Japan’s main producers of natural indigo dye. The prefecture has a unique brand of indigo dye, “Awa-ai,” refers to this heritage.
Indigo in Japan: The Magical Wonders of 'Aizome' – the thread
Aizome or The Art of Japanese Indigo Dyeing — Jeannine Cook
Indigo in Japan: The Magical Wonders of 'Aizome' – the thread
Aizome Traditional Indigo Dyeing in Kurume – Maris Around the World
Exploring the Origins of Aizome―Traditional Indigo Dyeing, JAPAN Monthly Web Magazine
Exploring the Origins of Aizome―Traditional Indigo Dyeing, JAPAN Monthly Web Magazine
A Study in Indigo: Behind Japan's Most Popular Hue, by Matt Gross, Airbnb Magazine
Aizome (Natural Indigo Dyeing), Dissertation
Aizome or The Art of Japanese Indigo Dyeing — Jeannine Cook
Aizome at Wanariya: Japan's Ancient Art of Indigo Dyeing