E-4 process

See also Ektachrome for full details of Kodak E-series processes.

The E-4 process is a now outdated process for developing color reversal (transparency) photographic film.

The process is infamous for its use of the highly toxic reversal agent TBAB. The use of the reversal agent permitted processing of the film without the manual reexposure that its predecessor E-3 required. The process was also faster and ran at 30°C (86°F), about 6°C (10°F) higher than E-3. The ME-4 process was a motion picture variation of the E-4 process.

The process was phased out in 1976 with the introduction of the E-6 process which was more environmentally friendly due to its lack of toxic chemicals.

Today the process is discontinued but was used up until 1996 for Kodak IE Color Infrared film. This was due to legal commitment by Kodak to provide the process for 30 years.

External links

• Kodak specifications for hand mixing of chemistry

Processing of older Ektachrome films (including Process E-4)

• Process C-22 UK and Europe
• Film Rescue USA and Canada
• Rocky Mountain USA