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Thread: Stop Bath Acidity?

  1. #1

    Join Date
    Nov 2006
    Location
    Mount Vernon, Virginia
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    200

    Question Stop Bath Acidity?

    FRiends one and all,

    Please help me avoid trying to fugure out the percent of acidity of an every day acetic acid stop bath? I know, I know, glacial to 28% to three to nine to whatever is easy for some, but not for this former history major.

    What, about, is the acidity of the average stop bath?

    TIA

  2. #2

    Join Date
    Sep 2003
    Posts
    1,791

    Re: Stop Bath Acidity?

    http://www.jackspcs.com/sb1.htm

    Kodak SB-1

    Or do you want a pH number?

  3. #3

    Join Date
    Nov 2006
    Location
    Mount Vernon, Virginia
    Posts
    200

    Re: Stop Bath Acidity?

    Quote Originally Posted by Nick_3536 View Post
    http://www.jackspcs.com/sb1.htm

    Kodak SB-1

    Or do you want a pH number?
    *****
    Hi Nick,
    Nope, that link was just fine. It said that a usual stop bath was 1.4% acetic acid. Just what I needed. Thanks a bunch.

  4. #4

    Join Date
    Sep 2003
    Location
    Santa Fe, NM
    Posts
    209

    Re: Stop Bath Acidity?

    John,

    pH is one thing, concentration is another. Don't feel bad my chemistry class was high school and JFK/LBJ was the prez.

    For film I mix half the dilution (not as stronger) and paper is a bit stronger (regular plus)

    Jan Pietrzak

  5. #5

    Join Date
    Oct 2006
    Location
    NYC
    Posts
    126

    Re: Stop Bath Acidity?

    Around pH 2-3 (exactly 2.04 if you consider that glacial acetic acid is 17M solution).

  6. #6

    Join Date
    Dec 2004
    Location
    Rochester NY
    Posts
    23

    Re: Stop Bath Acidity?

    Kodak Indicator Stop Bath is pH 3.0 at 68F.

    As a check, I just measured it with my handy dandy pH meter.

    Ron Mowrey

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