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  1. #1
    Akki14's Avatar
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    Starting point for bleaching back neg with potassium ferricyanide

    What sort of dilution do I need for bleaching back a negative with just potassium ferricyanide? Will refixing the negative in rapid fix be okay or will it do some harmful/bad reaction?
    I got a box of c.1968 HP3 4x5 sheet film and it has some heavy base fog... after searching around on here I read someone uses potassium ferricyanide to bleach the negative back to counteract base fog but no one ever says how much or a formula or starting point. I'd need enough liquid for a 10x12 tray so about a litre will do.

    Picture of the bad base fog in this thread: http://www.apug.org/forums/forum127/...tml#post525799
    ~Heather
    oooh shiny!
    http://www.stargazy.org/

  2. #2
    Ian Grant's Avatar
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    I doubt its worth it the fogging looks too bad. Start with a 1% solution of Potassium ferricyanide.

    Then refix when ready.

    Ian



 

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