The documentary Unsung Heroes of Ink, directed by Olivia Wang, will be released soon. It tells the story of xuan paper making, in the Anhui region (west of Shanghai) and the relationship artists have to it. Some big names of ink painting appear in this film, including Liu Dan who we speak about in week 2 of the ink series (!) ... pretty exciting. I have contacted Olivia to know when and where exactly we can watch the movie. More news soon.
Until then, watch the trailer https://www.scholarsinkstudio.com/unsung-heroes-of-ink