>>4493543>1996 was 31 years ago>mfwI've been shooting 30-40 years expired b&w film on the regular, not as a meme, and I love the results. About 1/3 of my work is on rolls expired that much. Pic related.
Since you already have them, then as other anon said, lfg. Because what else are you gonna do?
Based on storage conditions you described, I'd shoot them 2 stops over box speed. 2.5 to 3 stops if it regularly gets 30°C at your place in the summer.
In your situation, there are just a few complications:
- You have random rolls (assuming each one unique), so you don't have room to experiment and calibrate for best results.
- Biggest question, do you develop yourself? If yes, toss them in 1+100 Rodinal for an hour, agitate at the start and once halfway through. Can't go wrong for a first attempt with unknown old film.
- If you can be arsed at all, shoot 12 frames of one of them, 4 typical but varied scenes and light conditions, bracketing each shot +1/-1 (relative to your chosen base speed, as above) and develop just that. It should give you SOME idea of the condition which you can extrapolate to the other rolls. Some idea is infinitely more than no idea.
- Yes, you could add some BTA (benzotriazole) as fog restrainer, but it makes no sense if you're gonna be one and done with your rolls. It also takes trial and error (for each stock separately) to get it right, too little and you may as well have not used any, too much and it will eat out your shadows. Don't worry too much about fog, scanners can see through a lot.
- If you don't then you're gonna have to find a lab that does special processing for b&w, few do, and can be costly. But also a viable option.
In summary, go and shoot them and have fun. Yes, in your case it will be "experimental", so don't take them to once in a lifetime photoshoots. But you'll get something good out of them for sure.
As for the color ones, +3 box speed, send for regular C41 processing, but have zero expectations for results. HTH.