I have color snapshots from the 1950's and 1960's on fibre-based color paper. I can tell you from personal experience, they are inferior in every way to the more modern RC color paper. The while borders are much more yellow, and the images do not have the "depth" that modern papers do. What is good for b/w is not good for color in this case. I worked in a lab in the late 1960's that printed on Kodak pre-RC color paper. It was a long process, and the emulsion was very delicate. The roll paper, processed in a big Pako brand processor was dried face up on a big heated drum before being rolled up on a take-up spool. I remember one time, the paper getting stuck to the big drum. What a disaster that was.