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E-4 process

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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The E-4 process is a now outdated process for developing color reversal (transparency) photographic film.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 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. The E-6 process also replaced the E-3 process, which was prone to fading because of its inferior colour dyes.

Today the process is discontinued but was used up until 1996 for Kodak IE Colour Infra-red film. This was due to legal committment by Kodak to provide the process for 30 years. The Kodak specifications are still available for hand mixing of chemistry :here

Processing of older Ektachrome films including Process E-4 :

References

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