Hi Vladimir, I expose expired slide film at box speed, yes. This stuff does not handle over-exposure well. However, when it comes to colour-negative film (C-41), I typically add +1 stop of exposure for every decade past its expiration date. So if it’s something like Portra 400VC that expired in 2010, I’d shoot it as if it was an ISO 200 film and develop it normally. Hope that helps!
