Whoa! I really appreciate the link. Alternative Photography (aka - the historical processes) are still alive and thriving, though not for the masses. I am not sure if I would jump into this process but it is just absolutely fascinating. You might check out this link out ( https://www.alternativephotography.com/ )
Interesting look at very early colour photography.
https://youtu.be/hE3KjKg69ZA
(Eric could use a hair cut, IMO) :-)