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E-6 is a standardized color development process in the chemical photography to the development of reversal films for color slides . The "E" stands for Ektachrome ; the name comes from the inventor of this process, Kodak . Other companies such as Agfa , Tetenal or Fujifilm offer functionally equivalent slide development processes under different names, for example it was named AP 44 by Agfa .


The Ektachrome process E-6 replaced the environmentally harmful predecessor E-4 at Kodak in 1976 , and shortly afterwards it was also adopted as a standard process by other manufacturers. All current reversal films are now developed using the E-6 process; the only exception until 2009 was Kodachrome film. It was processed in the much more complex K-14 process, which was carried out for the last time at the end of 2010.


In its original form, seven baths are required for the E-6 process; it lasts 32 minutes; a shorter and newer version needs three baths and takes 26 minutes. The processing temperature in both cases is 38 degrees Celsius.

Original process

  1. Initial development
  2. Reversal bath
  3. Color development
  4. Conditioning bath
  5. Bleach bath
  6. Fixer
  7. Stabilizing bath

Shortened process

  1. Initial development
  2. Reversal and color development
  3. Bleach-fix bath
  4. Stabilizing bath

By changing the process conditions, color-distorting effects can be introduced into slides.

See also