Kodak R-21A Reversal Bath

Discussion in 'Kodak' started by Alan Smithee, Dec 6, 2006.

  1. Alan Smithee

    Alan Smithee Guest

    I'm having trouble locating a local source in Canada for concentrated
    sulfuric acid (98%) my photo chem supplier no longer carries it. Can the
    reversal bath formula R21-A be adjusted easily to use lower concentration
    products ie. automotive battery acid (33%)? Will the ph shift be a problem?
    Thx.
     
    Alan Smithee, Dec 6, 2006
    #1
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  2. Alan Smithee a écrit :
    I may be wrong but if you use 98/33 (roughly 3 times) more acid at 33%
    to replace the original 98% quantity and still keep the final volume,
    you should have the same final concentration of sulfuric acid in your
    bleach.

    I don't know if the automotive battery acid is pure enough for a
    photographic use but I suppose it is.

    Claudio Bonavolta
    http://www.bonavolta.ch
     
    Claudio Bonavolta, Dec 6, 2006
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