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Thread: Citric acid for 1-shot stop bath

  1. #1

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    Citric acid for 1-shot stop bath

    Economizing some more, I plan to eschew the cost and shipping charges (which are about equal) of my usual acetic acid stop when my stock runs out soon, and am looking toward citric acid as a replacement, since I have not seen anyone recommending ascorbic acid (which I already have) for stop. I'd like to have a teaspoon-type dilution for the citric, i.e., x tsp per liter, please. Unless hearing otherwise, I'll assume a capacity of 15 or more 8x10s per liter.

    Thanks.
    Philip U.

    Sine scientia ars nihil est. (Without science/knowledge, art is nothing.)
    https://www.flickr.com/photos/156933346@N07/

  2. #2
    Tin Can's Avatar
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    Re: Citric acid for 1-shot stop bath

    I use one scant teaspoon food grade citric acid crystals, bought in a can.

    I always mix new in 11X14 trays and toss after 10 8X10 prints.

    No smell at all.
    Last edited by Tin Can; 8-Apr-2019 at 11:53. Reason: add 8x10
    sin eater

  3. #3

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    Re: Citric acid for 1-shot stop bath

    I use 15 grams per litre and usually use 2 litres for printing. not sure how many prints I get but have processed more than 10 11x14 ( I think) and it still passed the squeak test).

    My citric acid is food grade and bought in 55 lb bulk container.
    notch codes ? I only use one film...

  4. #4
    Eric Woodbury
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    Re: Citric acid for 1-shot stop bath

    I just purchased a 5# bag from Amazon. $15.

    15 gr is more than a level Tbsp, less than heaping. Exactly equal to one generous T.

    e

  5. #5
    Jac@stafford.net's Avatar
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    Re: Citric acid for 1-shot stop bath

    How about vinegar?

  6. #6

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    Re: Citric acid for 1-shot stop bath

    I'm using 9% table apple vinegar, approx. 10 g. for 1 liter stop bath

  7. #7

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    Re: Citric acid for 1-shot stop bath

    I use 1 tsp per liter and typically have 2L in the tray. I don't keep specific track of how many prints have been through the stop, but my typically printing session is about 20 sheets of paper total, including test strips, work prints, etc.

  8. #8

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    Re: Citric acid for 1-shot stop bath

    I use about a tablespoon per liter and keep using it until it fails to turn the feel of a print "rubbery" in a few seconds. I have no clue about capacity; citric acid is cheap enough not to worry about things like capacity and cost.
    I sometimes use an acetic acid stop, which is simply a generous dash of cleaning vinegar to a liter of water.

  9. #9

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    Re: Citric acid for 1-shot stop bath

    Thanks to all.
    Philip U.

    Sine scientia ars nihil est. (Without science/knowledge, art is nothing.)
    https://www.flickr.com/photos/156933346@N07/

  10. #10

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    Re: Citric acid for 1-shot stop bath

    I throw a tablespoon of citric acid in about a liter of water,and start working.

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