The film fixes the color to the point in time when the original slides were shot on the camera--I don't think Dell had any of these scanned as he prefers the work that comes from traditional cameras. Once he put these together, he trimmed each one to final size, eliminating the register marks and the sets are held together with scotch tape with a piece of card stock that provides a white back ground. Perhaps some day reconstructing these as suggested may be the way to go. I still have the originals and I think the dyes are holding steady after all these years. Often the black image was printed on a piece of opaque film that Dell would hand write the photo information on, and this shows up in the scan, so black would be the first color printed so the succeding colors could be registered more easily, but then some of his film has black as the last color down on press. Here is a sample of these color keys that is compromised by the handwriting, but still a neat shot taken when I was 15 or 16 in Durango:
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Fritz