Talk:E-4 process

in the beginning ...
The article says when E6 replaced E4, but not when E4 originated. It would be nice to know the latter. Gah4 (talk) 09:32, 30 August 2019 (UTC)
 * OK, Ektachrome says 1966, with a reference. Gah4 (talk) 09:48, 30 August 2019 (UTC)

30C
OK, 30C is 86F, so one of them is wrong. Gah4 (talk) 13:58, 19 April 2021 (UTC)

E1 E2 E3 E4
I believe in some cases, the new process could be used on older film. I am not sure now which, but it would be nice to add to the articles. Gah4 (talk) 01:20, 25 August 2023 (UTC)