One of Japan's most prized textiles comes from a subtropical island where the makers still hew to the methods of 1,300 years ago. Using indigenous plants and ponds of iron-rich mud, the artisans of Amami-Oshima create luxurious silk pongee, threading the island's long history of poverty and oppression into their craft.

https://www3.nhk.or.jp/nhkworld/en/ondemand/video/3019161/