hello! I genuinely hope this video is useful to someone, I know I didn't cover everything, but I covered everything I know, and then some, so that's something.
@kaitekiart7666
a video from them I recommend https://youtu.be/aI-ufWU9j3Y
the single source I was able to find with anything new to say, someone better at research could probably find more.
https://www.jcccw.org/nikkei-news/2022/7/27/gansai-an-exploration-into-japanese-watercolors
art supplies featured in this video
Kuretake Gansai Tambi paints 48 set
Kuretake Gansai Tambi art nouvou set
Kuretake Gansai Tambi graphite set
Boku-Undo shadow set 1
Boku-Undo shadow set 2
Stonehenge hotpress watercolor paper