I've often wondered why you don't hear more about dry collodion work. There's a bucket of historical info out there. Carey Lea is a good source, available as a google book. starting on p. 261.
It looks like there are some options that don't involve ether (Unless I'm missing something. I understand next-to-nothing about collodion). ex. 'The Coffee Dry Process' on p. 276.
Re collodion color: Wall writes up pages of details in his 'History of Three Color Photography', 1925.
An aside: I love the history of my copy. It was a gift in 1950 from Eastman Kodak Company Research Laboratory to Dr. J. Eggert at the Photographisches Institut in Zurich. Dr Eggert pasted the letter from Kodak on the inside front cover. The only part of me that seems to want to move this morning is my fingers, so I'll type in the body of the letter
"Dear Dr. Eggert,
It has recently been brought to our attention by Dr. Spencer that you are desirous of obtaining a copy of Wall's "History of Color Photography", but that you have been unable to obtain one on the Continent. I understand from Dr. Spencer that he also has been unable to find a copy of this book in England.
Upon receipt of Dr. Spencer's letter I inquired of the librarian about the possibility of our having an additional copy of Wall's "History of Photography" which we might send to you. I find here is a copy, and I am very happy to be able to present it to you with the compliments of the Kodak Research Laboratory in the hope that you will find it useful in connection with the work at your Institut.
With kindest personal regards,
(indecipherable signature) "