C-41 Process

C-41 is a chromogenic color print film developing process introduced by Kodak, the process is also known as CN-16 by Fuji, CNK-4 by Konica, and AP-70 by AGFA.

Processed C-41 negatives, as with all color films, consist of an image formed of dye. Due to the long-term instability of dyes, C-41 negatives can will fade and color-shift over time.

The only reliable way to archive color film is to create yellow-cyan-magenta (YCM) separation master on black-and-white film coated on polyester base (ESTAR) and then store it in cold place with controlled humidity.