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Photo Forum / Film Photography / Darkroom / December 2004Ektachrome color shift?
I have a few hundred slides that were exposed and processed in the late 1950's and early 1960's. The slides are both Kodachrome and Ektachrome. I have noticed a distinct difference between them. The Kodachrome slides appear very good in their color balance - many of them look like they were taken yesterday. All of the Ektacrhome slides have a dominant red color. I am hoping that I can adjust for this after scanning them. Can anyone tell me why the E-6 slides have this red color shift? Would they have looked more balanced 45 years ago when they were first processed? Thanks, Nate Dyes fade. Ektachrome films (E-3, E-4, and E-6) are less stable than Kodachrome in the dark, where they spend most of their lives. The answer is to use Kodachrome whenever possible if you desire maximum dark-keeping stability. Kodachrome's dyes are of a different kind than Ektachrome dyes. Today's Ektachrome films are somewhat more stable than those of the past. Yes, when they were new the Ektachromes looked good. > I have a few hundred slides that were exposed and processed in the > late 1950's and early 1960's. The slides are both Kodachrome and [quoted text clipped - 8 lines] > Would they have looked more balanced 45 years ago when they were first > processed? Ektachrome dyes are not as stable as Kodachrome dyes. To prevent color shifts (predominantly yellow dye layer fading, then cyan, then magenta) you should store slides at 45F in the dark. You should also avoid projecting originals (which astronomically increases dye layer fading due to the heat and light intensity of projection lamps) and have dupes made for projection purposes. Kodachrome yellow dye layer fading is less than half that of Ektachrome films at normal room temperatures. But at refrigerated at 45 degrees F both are equally stable. Got a spare refrigerator? Why did Kodak stop producing Kodachrome 25? Kodachrome 64 is a bad replacement......they could have discontinued that instead. Kodachrome 25 in 120 format could have been interresting too. Kodachrome prints well on Ilfochrome. Max > Got a spare refrigerator? K25 was discontinued due to the sudden unavailability of a certain chemical component, according to Kodak. >Why did Kodak stop producing Kodachrome 25? I think that with the drop in poularity of 8mm/Super 8 movie cameras there was really limited demand for this stock. The slow speed is necessary in bright sunlight to keep the diaphragm at some reasonably large f/stop to avoid diffraction effects. <max_perl@post11.tele.dk> writes: >Why did Kodak stop producing Kodachrome 25? People stopped buying it. - now - Why did people stop buying it? I'll start things off: I only use Kodachrome for slides, so I am not the one to ask.  SignatureNicholas O. Lindan, Cleveland, Ohio Consulting Engineer: Electronics; Informatics; Photonics. Remove spaces etc. to reply: n o lindan at net com dot com psst.. want to buy an f-stop timer? nolindan.com/da/fstop/ No, this is not true. Kodachrome 25 was discontinued solely for technical reasons. If you don't know anything, shut the hell up! No, this is not true. Kodachrome 25 was discontinued solely for technical reasons. If you don't know anything, shut the hell up! >I have a few hundred slides that were exposed and processed in the > late 1950's and early 1960's. The slides are both Kodachrome and [quoted text clipped - 6 lines] > > Can anyone tell me why the E-6 slides have this red color shift? Those are E-4 slides and their cyan dye has faded out. > Would they have looked more balanced 45 years ago when they were first > processed? Yes. They would have looked quite normal. The newer E-6 process (which has been refined several times) was introduced partly to get around this fading problem, as I understand it. |
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