This won't help you, but my Dad was a great Ferraniacolor fan in the fifties, and I have about a hundred 6 x 6 cm transparencies (family photos). Some have faded, but some retain remarkable colour saturation. There is nothing in the selvage to say what sort of film it was, only Ferraniacolor on the envelopes. Unfortunately he is not around to tell us whether he sent the film away for processing or got it done locally. He probably bought at least some of the film in Italy as we holidayed there several times.