Powdered Fixer Chemical, rock solid with moisture. Is it usable ?

Discussion in 'B&W: Film, Paper, Chemistry' started by Mustafa Umut Sarac, Nov 12, 2012.

  1. Mustafa Umut Sarac

    Mustafa Umut Sarac Member

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    My neighbor is a photographer and I ordered 1 kilogram white powder to use as fixer. I think it was something thiosulfate or alike. I never used it and powder turned to rock solid. Is it usable after all ?

    Umut
     
  2. mopar_guy

    mopar_guy Subscriber

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    If I remember correctly regular fixers are Sodium Thiosulfate and rapid fixers were Ammonium Thiosulfate. To check for activity, put a clipped piece of film in the fixer and see how quickly it clears.
     
  3. mopar_guy

    mopar_guy Subscriber

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    Umut, If you try to mix the powder with water, I think that your chances to disolve the powder are excellent. Use water at 20 C.
     
  4. Gerald C Koch

    Gerald C Koch Member

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    The anhydrous forms of both sodium and ammonium thiosulfate will absorb moisture from the air and set like concrete. This is why sodium thiosulfate pentahydrate and ammonium thiosulfate 60% solution are usually sold. They are probably OK just get out a large hammer to break up the chunk.
     
  5. Mustafa Umut Sarac

    Mustafa Umut Sarac Member

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    Thank you Dave and Gerald.

    Dave, I love Cars, no new group like the 80s.