E-6 process

The E-3 process required fogging with light to accomplish image reversal and produced transparencies that faded quickly.

The E-4 process used polluting chemicals, such as the highly toxic reversal agent borane tert-butylamine (TBAB).

[1] Non-Kodak color reversal films introduced in the 1980s were compatible with the E-6 process, including variants of Fujichrome and Agfachrome, sold by Fujifilm and Agfa-Gevaert, respectively; one notable exception was Fujichrome 1600 Professional D, which was compatible with E-6 but used a customized PZ process for best results.

When the film is exposed, each layer records a latent image based on its sensitivity.

[15] However, the chemical production part of Tetenal 1847 was spun off as Norderstedter Chemiewerke in 2022, which filed for bankruptcy in February 2023[16] and the three-bath process is no longer available.