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  1. #1

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    Pyrocat HD Shelf Life

    I bought some liquid to develop T-Max 4x5. In the undiluted form, what is it's shelf life? What about after diluting?

  2. #2

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    Re: Pyrocat HD Shelf Life

    Toss it after use. It oxidizes.

    There are several formulas available. Did you purchase the version which is mixed in Water, or in Glycol ?

  3. #3

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    Re: Pyrocat HD Shelf Life

    I mean before use. I always throw out developer after use.

    I'm asking because, for instance, using HC-110, I leave it in concetrated form, and mix only enough developer to develop my current batch of negatives. HC-110 has a much longer shelf life in concentrated form. I want to know if I can do that with Pyrocat HD, or if I should mix the whole thing into working solution. If so, I'm guessing that the shelf life is much less. If it is, it would be wasteful for the amount of film I develop.

    I can't tell from the package whether it is water or Glycol, and their website doesn't say either. The catalog number is 01-5081. Could be one of those things where if it doesn't say "Glycol" explicitly, that means water.

  4. #4

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    Re: Pyrocat HD Shelf Life

    The Glycol based Pyrocat should last a good long time...think years. The Water based Pyrocat will last around a year.

  5. #5

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    Re: Pyrocat HD Shelf Life

    Leave it in concentrated form. Use it like you use your HC-110 syrup...mix up the working solution immediately prior to developing the film.

    Whose catalog # did you list? My understanding is that the Formulary now sells it in Glycol. I can't imagine there would be any demand for Water based Pyrocat if Glycol was available.

  6. #6

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    Re: Pyrocat HD Shelf Life

    Bought it from digitaltruth.com

  7. #7

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    Re: Pyrocat HD Shelf Life

    Ask digitaltruth if they mix it with Glycol. Formulary used to mix it with water, but they switched to Glycol almost a year ago.

  8. #8

    Re: Pyrocat HD Shelf Life

    It is obviously a product that Digitaltruth buys from Photoformulary, as the catalog number is the same and Digitaltruth promotes the fact that it is a Photoformulary product.
    Now, the only remaining question is whether your kit has been on the shelfs for a long time or if it's fresh. (Or: Did Photoformulary change the catalog number when they switched to Glycol?)

    //Björn

  9. #9

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    Re: Pyrocat HD Shelf Life

    Photoformulary lists 4 products

    Pyrocat HD Liquid 10 Liters - 01-5081
    Pyrocat HD Liquid 50 Liters - 01-5083
    Pyrocat-HD in Glycol 10 Liters - 01-5091
    Pyrocat-HD in Glycol 50 Liters - 01-5083

    so I guess they just sent what I ordered. I didn't know there was any difference, but I'll know for next time.

  10. #10

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    Re: Pyrocat HD Shelf Life

    Quote Originally Posted by Bjorn Nilsson View Post
    It is obviously a product that Digitaltruth buys from Photoformulary, as the catalog number is the same and Digitaltruth promotes the fact that it is a Photoformulary product.
    Now, the only remaining question is whether your kit has been on the shelfs for a long time or if it's fresh. (Or: Did Photoformulary change the catalog number when they switched to Glycol?)

    //Björn
    If you buy a Pyrocat kit directly from Photographers Formulary you can be almost certain that it has not been on the shelf a long time. PF has people mixing chemicals on a regular basis and I doubt very much they keep any of the kits on the shelf for more than about a month after mixing.

    Sandy King
    http://www.sandykingphotography.com/
    For discussion and information about carbon transfer please visit the carbon group at Yahoo.
    https://groups.yahoo.com/neo/groups/...nTransfer/info

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