The same thing has happened to Morrell Meats and Mothers Cookies (52/53) which both have semi-gloss surfaces, particularly when in screw downs or are densely packed in boxes.. I switched to mylar around 1990. It took nearly ten years to transfer the collection. For less expensive cards penny sleeves are fine (rotated every decade or so. Anything historically irreplaceable or valuable mylar is the best... or find out when it's too late..
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