I can make separation bromide prints on fibre or rc black and white paper> if anyone here wants to try to work out a Carbro workflow I will collaborate and supply the separated silver prints.
This is not a direction I am currently exploring but since I make silver gelatin positive prints as a matter of course, making negative bromides are very easy for me to do.
I have a ton of out dated rc paper black white which may work just fine.

If anyone is interested and wanting to work in collaboration over the winter on tri colour carbro send me a email bob@elevatordigital.ca , I am set up to be able to work with more than one worker if there is interest.

Quote Originally Posted by gmikol View Post
Chemically speaking, carbro and carbon are very different. Carbon transfer is an ultraviolet light sensitive process. The UV light reacts with a traditional sensitizer (potassium or ammonium dichromate), or with a "modern" sensitizer like we're discussing here, causes the gelatin to harden in proportion to how much light it received in order to trap pigment in the gelatin. You wash off the remainder in hot water, and are left with an image.

Carbro is a purely chemical process. It uses a very different sensitizer, which, when the sensitized carbon tissue is brought into contact with a conventional silver gelatin print, reacts with the silver and causes the gelatin in the carbon tissue to harden. The more silver (darker areas on the print), the more hardening of the carbon tissue.

There it is in one paragraph each.

William Crawford, "The Keepers of Light"
Richard Farber, "Historic Photographic Processes"
Sandy King, "The Book of Carbon and Carbro"

These 3 all have decent descriptions of the similarities and differences between the 2 processes. The first 2 are out of print, AFAIK, and the 3rd is self-published. Some google searching might yield some hits, too.

To others on this thread...I don't own any of Nadeau's books. Does he address carbro at all?

Hope that helps...