Control strips? How long do they keep?

Discussion in 'Darkroom Developing and Printing' started by Nick Zentena, Sep 12, 2004.

  1. Nick Zentena

    Nick Zentena Guest

    I'm thinking about getting some control strips to track how I'm doing.
    Will they keep if I freeze them? Looking at the ones available locally I'm
    leaning towards the Fuji ones. The box is smaller. Does it make a
    difference? I'm using a mix of Kodak,Fuji and Agfa film.

    Thanks
    Nick
     
    Nick Zentena, Sep 12, 2004
    #1
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  2. Nick Zentena

    Nick Zentena Guest


    And I mean C-41 strips if it matters.

    Nick
     
    Nick Zentena, Sep 12, 2004
    #2
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  3. Nick Zentena

    Nick Zentena Guest


    I reuse bleach and fix but make up fresh developer each batch. I'm just
    wondering how long the strips will be good for if frozen? The small box is
    30 strips and that's a lot of batches of film.

    Thanks
    Nick
     
    Nick Zentena, Sep 13, 2004
    #3
  4. Nick Zentena

    McLeod Guest

    Yes, they should be stored frozen. Take one out at a time and store
    them in a paper safe or other dark storage for the same amount of time
    each time, usually 10 or 15 minutes is enough for them to be totally
    up to room temp before processing.
    If you are using a rotary tube processor that has consistent temp and
    agitation and the chemicals are fresh each time you may just want to
    run enough to see if your developer time should be longer or shorter.
     
    McLeod, Sep 13, 2004
    #4
  5. Nick Zentena

    Jazztptman Guest

    I'm thinking about getting some control strips to track how I'm doing. Will
    they keep if I freeze them? Looking at the ones available locally I'm leaning
    towards the Fuji ones. The box is smaller. Does it make a difference? I'm using
    a mix of Kodak,Fuji and Agfa film. And I mean C-41 strips if it matters.<<

    Nick, when stored in a freezer, most C-41 control strips are good for about 14
    months after manufacture. The Kodak strips have an expiration date on each box
    along with the batch code number.

    They will remain good for a reasonable time after that, but eventually the blue
    Dmin will begin to increase from the effect of ambient radiation on the film.
    Eventiually, the LD and HD will shift.This is true of any brand of film or
    control strip. Older film you are shooting in your camera may still give good
    results a year or two after expiration, but when you are trying to hold a Dmin
    control plot to +.03 action and +.05 control limits. it just won't work.

    Unless you are using a replenished processor and need to track the consistency
    of your process from day to day and make chemical corrctions if needed, I don't
    think you really need the expense of control strips. For a rotary tube or small
    tank process using fresh developer each time, it will help you verify your time
    and temperature, but after that initial run, you shouldn't see any change if
    you are consistant in your methods.


    Bernie
     
    Jazztptman, Sep 13, 2004
    #5
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