This is a surprisingly interesting documentary about making ink by hand, focussing especially on an artisanal ink maker now living in Toronto. This (free) link is from the National Film Board but the film is also available elsewhere including CBC GEM,
https://www.nfb.ca/film/the-colour-of-ink/. It's probably available internationally on other sites, a quick search should find those outlets. It's just under 2 hours long.
