To those who have worked with lacquer discs I have a question. Have you ever encountered a disc that has turned yellow or brassy copper? I have run across a multiple discs with this strange coloring. The only thing I can guess it might be is some kind or reaction the lacquer has with the air but I am wondering why some discs have it and some don't from the same collection that has been stored in the same place for 65 years. It can't be oxidation and it mainly occurs where the hole in the sleeve was, sometimes on the edge of the disc. When looked at under a microscope it almost seems translucent. Any information will help.
here is a picture
Audio Visual Specialist
Media Digitization and Preservation Initiative
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