Ektachrome color shift?

Discussion in 'Darkroom Developing and Printing' started by Nate, Dec 12, 2004.

  1. Nate

    Nate Guest

    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
     
    Nate, Dec 12, 2004
    #1
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  2. 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.
     
    uraniumcommittee, Dec 12, 2004
    #2
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  3. Nate

    Tom Phillips Guest


    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.
     
    Tom Phillips, Dec 13, 2004
    #3
  4. Got a spare refrigerator?
     
    uraniumcommittee, Dec 13, 2004
    #4
  5. Nate

    MXP Guest

    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
     
    MXP, Dec 13, 2004
    #5
  6. K25 was discontinued due to the sudden unavailability of a certain
    chemical component, according to Kodak.
     
    uraniumcommittee, Dec 13, 2004
    #6
  7. Those are E-4 slides and their cyan dye has faded out.
    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.
     
    Michael A. Covington, Dec 15, 2004
    #7
  8. Nate

    ZorziM Guest

    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.
     
    ZorziM, Dec 15, 2004
    #8
  9. 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.
     
    Nicholas O. Lindan, Dec 15, 2004
    #9
  10. No, this is not true. Kodachrome 25 was discontinued solely for
    technical reasons.

    If you don't know anything, shut the hell up!
     
    uraniumcommittee, Dec 15, 2004
    #10
  11. No, this is not true. Kodachrome 25 was discontinued solely for
    technical reasons.

    If you don't know anything, shut the hell up!
     
    uraniumcommittee, Dec 15, 2004
    #11
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