PE - I have both of the books to which you refer. The little "Making Color Prints" book is here on my desk now. I just reread the tiny chapter on tricolor bromoil printing. It's still my opinion that full or tricolor transfers were produced in the "good ol" days on an infrequent basis by a very few and not routinely by large numbers of bromoilists. Compared to traditional bromoil, tri-color bromoil was somewhat of a mechanical process: inking film matriices by a roller, not a brush. The color process had few of the controls that bromoil was known for and few ways to express artistic creativity. The tricolor inks sold were not only used by those producing full color prints, but by those doing color layering from one unseparated negative. I use them now - except they are vintage inks from Drem in Austria and Sinclair in London, not Partington (misspelled "Parkington" in the book). Some of the monochrome transfer artists, Robert Desme as an example, used film for the matrix also, which made multiple transfer a snap when it came to registration. Alas, Agfa up and changed the emulsion formula of the film in the early 70's I believe it was, and then only photo paper could be used, and, of course, when the paper matrix was soaked in water one experienced the shrink/swell factor and registration became much more difficult. Desme gave up transfer at this point as did some others. I have long studied the history of bromoil to the extent that I could find information. I would be very interested in the names of any photo artists in the USA who produced tricolor or full color bromoil prints. I know many produced these in carbro and carbon. The only tricolor bromoils that I have come across were commercial photo illustrators. One reason, perhaps, is that the old one shot 3 color cameras were both heavy and expensive and most bromoilists were amateurs and artists. And - there were a number of other processes that could produce full color prints easier and better than bromoil! Dr. Emil Mayer's book, "Bromoil Printing and Transfer," only makes a two paragraph mention of making a full color transfers from separated negatives, saying that it is extremely difficult and requires a complete mastery of the process. Mayer elaborates on polychrome transfers, but these were like I now work, from one unseparated negative and utilizing various colors of ink. Mayer himself was a master of transfer, but only produced monochrome prints. Or, at least, no color prints of his have ever been found.
PE, this has been a most interesting discussion!
Cheers,
Gene