How to develop old vintage expired analog film
Golden Rule: 1h @ Rodinal 1+100 + KBr 1g / 1 litre
If you never developed a film by yourself - please go to my Guide to dark room, but assuming developing films isn't a problem for you, developing old vintage expired analog film is easy as any other one.
First - developer. It should be strong to extract image from old vintage expired analog film, so Rodinal is the best choice. It should be slow to not cause grain to big, so proportion 1:100 will be good.
Then - potassium bromide, KBr. It's a magic trick that reducing smoke on films and papers. I don't know (yet) chemistry background "why" - but it works. Developer with 1g KBr per 1 litre of developer will significantly reduce "smoke" on old vintage expired analog film. You can collect it easily from any good chemistry store.
Then - time and agitation. All sources says 1 hour development and there is no discussion, 1h is good for vintage expired analog film and 1:100 Rodinal. Agitation is more tricky as different sources says differently - from "do not touch tank at all" to "agitate every 5 min". My opinion? Somewhere in between, I'm agitate very slowly every 15min of developing.
The rest of developing process is totally the same like any normal fresh new film.
So summary: 1 hour in Rodinal with proportion 1:100 and 1g of potassium bromide per 1 litre of developer, agitated slowly once per 15 minutes.
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