This morning while cleaning out a seldom used closet, I was surprised to find 5 rolls of TRI-X flim that I shot in the early 1990s but never developed. Don't know what's on them, but I did date the film cannisters. Since I always would develop film within a week of shooting pictures, I was wondering how long exposed film can sit undeveloped without "going bad." Will I still get pics from these rolls almost 20 years old? (They're all black/white film) Anyone have any experience similar to mine?