Quote Originally Posted by falotico View Post
Wall has a good discussion about sensitizing collodion emulsions with commercial dyes. His book, "The History of Three Color Photography" is available online--the collodion discussion starts about page 222. Here is the link:

https://archive.org/stream/historyof...e/238/mode/2up

There is also a book from 1905 by Oscar Klein which is also online, "Collodion Emulsion and its Applications..." which deals with making collodion emulsions color sensitive using common dyes. That link is:

https://archive.org/details/collodionemulsi00kleigoog

In addition there are various Kodak publications from the 1920s which deal with sensitizing collodion, as I recall. Search the topic through Google Books.
Thanks-this is a big help