This is probably gone now. Does Fuji still process E-6? I use to buy the processing envelopes to mail the film to Fujifilm for processing the slides. If not, who does E-6 processing at a reasonable cost? I found 2 rolls of Velvia 50 in the freezer and want to try them out. Is 10 years too old?

The Fujifilm Neopan 100 Acros film is my favorite modern BW film in MF and 35mm. Under controlled development, the results are always the same. I bought a bunch when it was re-released and put it the deep-freeze.

Film "ripens" and then deteriorates. Professional films are at peak sensitivity around zero to three months from manufacture, and amateur films are at peak sensitivity around 6-12 months from manufacture. By the expiration date on the box, it might have lost 1/3 of an f/stop. That is significant for slide films, but relatively insignificant for negative films.

The main thing you can do to preserve the life of unexposed film is to protect it from all forms of radiation from 1 GHz radio waves all the way to cosmic rays. Keep it in a refrigerator in the original SEALED container, or freeze it if you intend to keep it for a long time. Wrapping the original boxes in aluminum foil inside plastic containers is often recommended.

Heat (infrared, and microwave radiation from all sources including cell phones and WiFi), and light, UV, X-Rays, Gamma Rays, and Cosmic Rays can all fog film over time. Heat fog is particularly bad because heat goes right through the packaging. Static electricity can also fog film.

Faster films fog faster than slower films.