Thank you for this enlightening aspect of preservation history. Much appreciated. We are ever so fortunate to have these advancements and tools.Before wet-gate printing, and occasionally thereafter, negatives would be coated with a lacquer substance to protect the emulsion from damage. The neg could be run dozens of times, or more - until the lacquer was being damaged.
Then the lacquer would be removed, and the element re-lacquered for more printing. One of the most problematic cases of lacquer/de-lacquer damage I came upon was Rear Window. OCN had been run over 300 times, and during a de-lacquer, part of the outermost dye layer (Y) was removed, which caused yellow spotting o all future prints and dupes. It can be seen in early videos.
This problem led to the creation of our Alien Layer Technology.
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