Kodak HCA - longevity? quick question

Discussion in 'B&W: Film, Paper, Chemistry' started by Sim2, Nov 3, 2011.

  1. Sim2

    Sim2 Member

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    Hallo,

    Quick question about Kodak HCA. When the stock solution is diluted to the working solution, does it have a shelf life? and what is it?

    The packet only says that it lasts 24 hours in an open tray but if it was stored in a container like dev and fix, would it last?

    Thoughts and answers welcomed!

    Sim2.
     
  2. Mike Pieper

    Mike Pieper Member

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    If you're talking about using it for film, then don't dilute the stock solution until you're ready to start developing. If the working solution only lasts 24 hours in an open tray, then it's probably not going to last that much longer in a container. I imagine it's just like using D-76 1:1. You dilute it right before developing and you're only supposed to use it one-shot as it won't last very long when diluted. And HCA working solution is much more diluted than D-76.
     
  3. Gerald C Koch

    Gerald C Koch Member

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    Once used HCA tends to grow mold and other crud. It is best used as a one shot and then discarded. It's not expensive and trying to save the used solution would be a foolish economy.
     
  4. Sim2

    Sim2 Member

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    Hallo,
    Growing mold does seem to be a good reason not to keep it! :laugh:

    The reason I ask is that sometimes I only have time to print one neg in the evening and the HCA will be no where near exhausted after this, if kept (during a week?) it would save mixing up a fresh batch virtually for each print, but mold - not good. :sad:

    See, you try to conserve resources and *sheesh* the stuff goes moldy as soon as you turn your back. Looks like best to continue with the discard routine.

    Thanks,
    Sim2.
     
  5. Gerald C Koch

    Gerald C Koch Member

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    Since you live in a cooler location you may be able to keep the solution for a few days. But here in the south US it is too hot for most of the year. Check the solution for any slime which may form. Bits of emlsion which come off provide nutrients for micro-organisms.
     
  6. 2F/2F

    2F/2F Member

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    I've used dilution H (twice as dilute as dilution B) after about a month in a full glass jar, and it worked as normal. Haven't tried any longer than that.

    Edit: Completely ignore that. I was talking about HC-110.