Do vintage cartridges deteriorate in performance by virtue of being exposed to air? I have heard that the only way to preserve their performance is to pack them in some chemical solution. Any comment would be appreciated.
A bit extreme don't you think? Packing them in their original container and making sure a small bag of fresh silica gel is in there should be enough. The rubber will degrade with age just like we do. How long are you planning on keeping these carts?
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