Another F8 Rapid Fixer Question

Discussion in 'Darkroom Developing and Printing' started by Ken Smith, Dec 25, 2003.

  1. Ken Smith

    Ken Smith Guest

    If an acid stop bath is used, I use Citric Acid, will any carryover
    into the F8 Fixer be a problem? Is a different Fixer solution prefered
    when using an acid stop bath?
    Ken Smith, Dec 25, 2003
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  2. I think this is the same question as appears under a
    different thread. Citric acid works fine with all fixers. In
    theory, it should not be used with hardening fixing baths
    because it interferes with the hardening. In practice it
    probably makes little or no difference unless one is doing
    high volume work were a lot of the stop is carried over into
    the fixing bath. If a non hardening bath is used, or if
    hardening is not critical to your work (it hardly ever is
    with modern materials) the effect is not significant.
    Ilford's pacakged stop bath is made of Citric acid. Citric
    does not have the strong Vinegar odor of Acetic acid. Acetic
    has become standard because it is compatible with alum
    hardener and because it probably has somewhat better
    buffering capacity than Citric acid.
    The use of Citric acid stop bath, and low acidity
    (non-hardening) fixing baths is much kinder to the nose than
    the conventional formulas.
    Richard Knoppow, Dec 27, 2003
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