I remember developing a box of super-XX film on film rather than glass in the early 1970's. At that time I was using D-76 for everything. Benzotriozole (anti-fog solution) might help as well. Are the plates wrapped in paper or plastic and if the plastic is sealed the plates might yield something and with anti-fog solution. According to net info it was sold up to 1992 in sheet film format. I think I did a zone system curve plotting of Super XX film in the mid 1970's. It had very straight curves for zone system development.
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