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    Christopher Walrath's Avatar
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    Ilford IF-15 Potassium Alum Acid Hardener-Fixer

    Ilford IF-15 Potassium Alum Acid Hardener-Fixer

    This hardening fixer is intended for use with films and plates.

    Sodium thiosulphate (hypo), cryst . . . 320g
    Sodium Silphite, anhyd . . . 30g
    Boric Acid, cryst . . . 10g
    Acetic Acid, glacial . . . 18cc
    Potassium Alum, cryst . . . 25g
    Water to make . . . 1 litre

    Dissolve the hypo in 500cc of hot (52C or 125F) water. Upon cooling, add the sulphite.

    Dissolve the boric acid, acetic acid and alum in 150cc of hot (52C or 125F) water. Allow this to cool to below 20C (68F).

    Now slowly pour the acid-alum solution into the hypo-sulphite solution and add enough water to attain a total volume of one litre.


    To obtain full hardening, films should be allowed to remain in the bath from 5-10 minutes.
    Thank you.
    CWalrath
    APUG BLIND PRINT EXCHANGE
    DE Darkroom

    "Wubba, wubba, wubba. Bing, bang, bong. Yuck, yuck, yuck and a fiddle-dee-dee." - The Yeti

  2. #2
    Christopher Walrath's Avatar
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    As always, please exercise extreme caution when handling caustic chemicals such as acids. Wear those aprons, gloves and goggles my pretties. Wouldn't want something untowards to happen to you.
    Thank you.
    CWalrath
    APUG BLIND PRINT EXCHANGE
    DE Darkroom

    "Wubba, wubba, wubba. Bing, bang, bong. Yuck, yuck, yuck and a fiddle-dee-dee." - The Yeti



 

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