While there have been a handful of great informative videos and articles that have been produced over the years on Japanese denim craft, this is by far the best example depicting the process of Hank Dyed Natural Indigo derived directly from local Japanese Indigofera plants.
The process is sacred and meticulous, with a history spanning centuries in the same northern Japanese region of Tokushima. Watch the video (in case you haven't already!) and learn about the tedious procedure that is the production of local Japanese Natural Indigo.
Video Credit : The Great Big Story