I recall from Photrio, I think, that stronger solutions of benzo will work up to a certain level of age fogging but not beyond that. I'd imagine that anything up to light grey might be curable but once you get beyond that then while you will clear the borders back to a light grey or possibly very light grey then you may have to live with slightly grey borders which as long as the picture comes out OK may be fine.
Depending on the photo a light grey border might look OK
Mike
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