Color prints from the era of about 1960 - 1985 were best stored at a pH value of 3.5 - 4.5. In fact, this buffering of the pH was one of the functions of the old Stabilizer. Even after its elimination, I had recommended the continued use of a stabilzer for this purpose. Current papers require a more neutral pH value. The papers from the era above, if not stabilzed, would tend to lose cyan dye, especially when poorly washed.
Ciba/Ilfochrome should never be stored with chromogenic papers, nor should they be stored under the same conditions.
PE
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