Silver Clouding on back of 4x5 negative

Hello, I have some 50 year old 4x5 negatives that have a silver-like clouding on the back side. It makes up about a 1 inch boarder and shows through when I make prints. I'm guessing that the negatives weren't fixed correctly long ago, and I've tried refixing one and it didn't work. Does anyone know of some kind of correction, like a chemical or product to use to eliminate the silver clouding? Thank You

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