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Thread: Hypo clear?

  1. #21

    Join Date
    Jan 2019

    Re: Hypo clear?

    Here is an MSDS for Perma Wash that lists a couple of ingredients:
    Ammonium sulfite and sodium ethylhexyl sulfate are the two listed.

    Ammonium sulfite is close to the same sulfite ion per molecular weight as sodium sulfite. I don't know if ammonium sulfite acts faster or more efficiently than sodium sulfite. I washed longer than their (IIRC) somewhat absurdly short recommended wash times. Perma Wash is a little more convenient and/or stock solution is longer lasting than Kodak HCA, but if one is making wash aid from sodium sulfite that's less of an issue.

    I have films and RC papers from 20-25 years ago that were wash-aided with Perma Wash and don't seem to have degraded, but no fiber base papers, and I didn't do residual fixer tests.

    (By the way, why does ammonium thiosulfate (rapid fixer) fix faster than sodium thiosulfate? I wondered if that was related, but couldn't find an answer, even though it is presumably well understood.)

  2. #22

    Join Date
    Oct 2019

    Re: Hypo clear?

    I put 12.5g of HCA in 500mL of warm water with a magnetic stirrer at the start of each session. It's kind of hard, so the heat and the stirrer help it to be completely dissolved by the time I need it.

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