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  1. #1
    scootermm's Avatar
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    Mixing Kodak HCA

    Ive done a pretty exhaustive internet/forum search on here and a few other forums. I ordered the chemicals from chemistrystore.com to mix it up myself... but dont know the quantities. I usually purchase the dry packs of Kodak HCA at a local photo store here in Austin, but alas they have gone the way of the dodo and no longer carry ANY darkroom chems or supplies. So I thought Id remedy it and premix the dry chems myself.

    can anyone assist in telling me what ratios to mix up the chemicals?

    thanks in advance.

  2. #2
    Lee L's Avatar
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    From Anchell's Darkroom Cookbook

    water 750 ml
    sodium sulfite 200 grams
    *sodium bisulfite 50 grams
    water to 1 liter

    To make a working strength bath, dilute 1 part washing aid to 9 parts water.

    * The sodium bisulfite lowers the pH in order to prevent softening of the emulsion of film. If used with paper, the bisulfite may be left out in order to improve the paper's gloss.


    Lee

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    HCA

    Quote Originally Posted by scootermm View Post
    Ive done a pretty exhaustive internet/forum search on here and a few other forums. I ordered the chemicals from chemistrystore.com to mix it up myself... but dont know the quantities. I usually purchase the dry packs of Kodak HCA at a local photo store here in Austin, but alas they have gone the way of the dodo and no longer carry ANY darkroom chems or supplies. So I thought Id remedy it and premix the dry chems myself.

    can anyone assist in telling me what ratios to mix up the chemicals?

    thanks in advance.
    Matt,
    What chems did you buy? I have the formula for HE-1 from Kodak and will forward it to you. It states that this formula reduces hypo all the way to sodium sulfate which is harmless to the silver image and soluble in the final washing. They are talking about prints in this case but it will work just the same.
    Tav

  4. #4
    scootermm's Avatar
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    The chems I purchased were/are 12lbs of Sodium sulfite and 2 lbs of sodium metabisulfite. (along with some citric acid, oxalic acid, and EDTA - but those are for other uses)

    Forgot to mention the reason I bought the chems was because I have had great experience using Kodak HCA as a clearing agent for pd/pt prints. I usually bought about 4 packets of it and poured all the packets into a container and would create my three clearing baths by spooning 4 heaping spoonfuls into a tray of 4Ls of hot water along with a few spoonfuls of EDTA, works quite well to clear all the papers I have tried out (Fabriano Artistico, Rives BFK, Cranes Cover/platinotype, Arches Platine, and a few others)

    From Lee L's comment I believe I will premix 2000 grams of dry Sodium Sulfite with 500 grams of dry Sodium Metabisulfite and then when I create each clearing bath Ill be able to just spoon out the heaping tablespoons into the trays.

    sounds like that may be the simplest manner to do it.

  5. #5

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    Matt, not the formula for HCA..but to clear my pd/pt prints I use a teaspoon of sodium sulfite and the same of EDTA per liter of warm water. Use it just as you describe above...have not had any issues. HCA has some other items in it, but the sulfite is the primary - mixed with the EDTA I think you should be fine. BTW have a copy of Anchell's cookbook, so give a shout if you need me to find it and look something up.
    Mike C

    Rambles

  6. #6
    scootermm's Avatar
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    thanks mike and thanks to everyone else for the info.

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    HCA

    Quote Originally Posted by scootermm View Post
    The chems I purchased were/are 12lbs of Sodium sulfite and 2 lbs of sodium metabisulfite. (along with some citric acid, oxalic acid, and EDTA - but those are for other uses)

    Forgot to mention the reason I bought the chems was because I have had great experience using Kodak HCA as a clearing agent for pd/pt prints. I usually bought about 4 packets of it and poured all the packets into a container and would create my three clearing baths by spooning 4 heaping spoonfuls into a tray of 4Ls of hot water along with a few spoonfuls of EDTA, works quite well to clear all the papers I have tried out (Fabriano Artistico, Rives BFK, Cranes Cover/platinotype, Arches Platine, and a few others)

    From Lee L's comment I believe I will premix 2000 grams of dry Sodium Sulfite with 500 grams of dry Sodium Metabisulfite and then when I create each clearing bath Ill be able to just spoon out the heaping tablespoons into the trays.

    sounds like that may be the simplest manner to do it.
    HE-1 is as follows:
    Water........500ml
    Hydrogen Peroxide......125ml (3% solution)
    Ammonia Solution.......100ml(1 part concentrated ammonia(28%) to 9 parts water
    Add water to make 1 liter.

    This comes from the Photo Lab Index-1976 Edition. It states that in the past many different formulas failed to oxidize hypo to harmless sodium sulfate. It states that HE-1 does just that completely. Good luck.

    Tav

  8. #8
    David Brown's Avatar
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    Quote Originally Posted by Lee L View Post
    sodium sulfite 200 grams
    Anybody know how much that is in teaspoons or tablespoons?

    (for the scaleless ...)
    David
    Taking pictures is easy. Making photographs is hard.

    http://www.behance.net/silverdarkroom
    http://silverdarkroom.wordpress.com

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    Measures

    Quote Originally Posted by David Brown View Post
    Anybody know how much that is in teaspoons or tablespoons?

    (for the scaleless ...)
    A teaspoon is 5ml. A tablespoon is 15ml. Hope that helps.

    Tav

  10. #10
    David Brown's Avatar
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    ..
    Last edited by David Brown; 03-02-2007 at 11:50 AM. Click to view previous post history. Reason: never mind - found the answer
    David
    Taking pictures is easy. Making photographs is hard.

    http://www.behance.net/silverdarkroom
    http://silverdarkroom.wordpress.com

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