< Three-color carbro was pretty much the standard for advertising art
<before the easier to handle dye transfer process superceded it around the
<late 1940's.
I'm sorry but have to desagree with you about this paragraph. 3-color carbon is NOT easier than dye transfer process. It IS easier than 4-color carbon. Dye transfer replaced the carbro process in the advertising field of that time not because it is easier, which is not, but because the astonishing amount of manipulation that it is able to offer, from the development of the matrixes up to the transfer of the colorants itself, giving to the photographer a great amount of possibilities to chance things (color, contrast, etc.) in the results. Dye Transfer process is to carbro what B&W is to Color transparencies nowadays. Of course, once you have your matrixes, dye transfer is the king, because you dont have to repeat all the process, but that is another matter and is not too relevant to advertising people.
Lázaro Issi
Madrid, Spain