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Thread: Citric acid equivalent for acetic acid bath.

  1. #1
    Ironage's Avatar
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    Citric acid equivalent for acetic acid bath.

    I donít have any acetic acid and need to mix a equivalent using citric acid which I have on hand. How much citric should I use to replace a 10ml glacial acetic acid to 1000ml water solution? I also had read that vinegar is acetic acid at about 6 percent. Could that be used as a replacement?

  2. #2

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    Re: Citric acid equivalent for acetic acid bath.

    From "The Darkroom Cookbook" 15G Citric Acid to make 1L.
    For prints, I use 2TBS per gallon.
    For film I use 0G per Liter (plain water)

  3. #3

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    Re: Citric acid equivalent for acetic acid bath.

    Anchell's book indicates 15grs/l of citric acid to make a stop bath working solution.
    This is what I use. It is not exactly what you're asking for but, looking at the formulation of
    acetic acid based stop bath (48ml of 28% acetic acid per liter), it's not too far away.
    Best,
    Pau

    Some pictures in Flickr.

  4. #4
    Tin Can's Avatar
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    Re: Citric acid equivalent for acetic acid bath.

    I use a heaping teaspoon of food grade powder citric acid in a 11X14 tray for 8X10 prints
    2022

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    Re: Citric acid equivalent for acetic acid bath.

    Plain white vinegar from the supermarket is typically approx. 5% acetic acid. Dilute 1+1 with water for a normal working acetic acid stop bath. Doesn't need to be precise.

    Quote Originally Posted by Ironage View Post
    I don’t have any acetic acid and need to mix a equivalent using citric acid which I have on hand. How much citric should I use to replace a 10ml glacial acetic acid to 1000ml water solution? I also had read that vinegar is acetic acid at about 6 percent. Could that be used as a replacement?

  6. #6
    Ironage's Avatar
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    Re: Citric acid equivalent for acetic acid bath.

    You all are a wonderful resource.

  7. #7
    Drew Wiley
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    Re: Citric acid equivalent for acetic acid bath.

    Avoid vinegars with a distinct color which might stain. Should be water white. I prefer only around 1/2% acetic acid, and discard the bath after the daily session. If your stop bath still smells like vinegar, but is not noxious, it's strong enough. All you want is a minor basic pH shift from the alkaline developer itself.

  8. #8
    おせわに なります! Andrew O'Neill's Avatar
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    Re: Citric acid equivalent for acetic acid bath.

    I use vinegar at the school I teach photography, as it's plentiful and cheap. Diluted at "about" 1+1. At home I sometimes use vinegar, but more often use citric acid. One tablespoon per litre.

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    Re: Citric acid equivalent for acetic acid bath.

    Acetic acid (in whatever form) is stinky. I recently started using a citric acid stop bath; my dilutions are approximate, but it's worked fine so far. In addition to that, for several years I've used TF-5 fixer. No more smelly darkroom!

  10. #10

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    Re: Citric acid equivalent for acetic acid bath.

    At least with my water, a citric acid stop bath won't last as long stored in a bottle so I tend to use it fairly quickly and then dump.

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