I offered to print some 1972 negatives for a friend and picked them up today. He is originally Mexican, these were shot there, and the negatives say, "Kodak 4 Safety Film." I looked because, when I removed them from the aging glassine envelope, I found that while 3 of the 6 strips look normal, though underdeveloped, the image (not the base) of others is yellowish-green rather than black.
I first thought they might have been improperly fixed, so a clipped one neg and fixed; no change. I washed it and put it in a selenium intensification bath (AA's formula) for 5 minutes. The result is very little intensification and change to a brownish image, which at least indicates, I assume, that the toner did its usual job.
Anyone seen something like this and know what's going on here? I'm leaning toward intensifying the rest of the negs, since they're very thin to begin with.
My enlarger is LED diffusion, so I don't expect heat problems if the base is indeed nitrate, but I will be most grateful for any cautions/advice on handling.
Thanks.
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