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  1. #1
    Christopher Walrath's Avatar
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    Ilford IF-13 Potassium Alum Acid Hardener-Fixer

    Ilford IF-13 Potassium Alum Acid Hardener-Fixer

    This fixer is intended for use with photographic papers.

    STOCK HARDENING SOLUTION
    Sodium Sulphite, anhyd . . . 50g
    Acetic Acid, glacial . . . 75ml
    Potassium Alum, cryst . . . 100g
    Add water to make . . . 1 litre

    Dissolve the sulphite in 200cc of water warmed to 52C or 125F thoroughly and allow it to cool. Then add the acid very slowly with constant stirring.

    Dissolve the alum in 600cc of water warmed to 52C or 125F. Allow it to cool to below 20C (68F).

    Pour the alum solution slowly and carefully INTO the acid solution, not the other way around. Top off with water to attain your 1 litre volume.


    WORKING SOLUTION
    Dissolve 200g of Sodium thiosulphate (hypo), crystal, into 500cc of warm (52C or 125F) water. Allow to cool and then add 125cc stock hardening solution into it and then top it off with water to attain a volumne of 1 litre.
    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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