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Blue Alchemy: Stories of Indigo (2016) is an independent documentary film, funded by Women Make Films, a non-profit media organization. It was filmed in India, Japan, Bangladesh, Mexico, El Salvador, Nigeria, and the USA. It showcases the historical and geographic spread of indigo, both as a dye and as an idea.

Description: “BLUE ALCHEMY: Stories of Indigo is a feature-length documentary about indigo, a blue
 dye that has captured the human imagination for millennia. It is also about people who are reviving indigo in projects that are intended to improve life in their communities, preserve cultural integrity, improve the environment, and bring beauty to the world.”

Recommended by Min-Chin Chiang from TNUA, Taiwan.