Perma-Wash

Discussion in 'B&W: Film, Paper, Chemistry' started by Maine-iac, Jan 28, 2005.

  1. Maine-iac

    Maine-iac Member

    Messages:
    465
    Joined:
    Oct 12, 2004
    Location:
    Island Heigh
    Shooter:
    Med. Format RF
    Does anyone know the composition of Perma-Wash? Is it just a concentrated stock solution of sulfite, or does it have other ingredients?

    What I'm really asking, I guess, is: is it worth buying this or any other commercial washing aid, or is mixing 25g sulfite per liter of water going to do the same thing for me?

    Larry
     
  2. Lee L

    Lee L Member

    Messages:
    3,247
    Joined:
    Nov 17, 2004
    Shooter:
    Multi Format
  3. Tom Hoskinson

    Tom Hoskinson Member

    Messages:
    3,879
    Joined:
    Mar 7, 2004
    Location:
    Southern Cal
    Shooter:
    Multi Format
    Larry, in my experience, 20 to 30 grams per liter of sodium sulfite works fine as a one-shot, post fixer pre-wash bath.

    For a reusable buffered solution, add about 5 grams per liter of sodium bisulfite to the mixture.

    See the postings in the APUG Chemistry Recipes.
     
  4. Maine-iac

    Maine-iac Member

    Messages:
    465
    Joined:
    Oct 12, 2004
    Location:
    Island Heigh
    Shooter:
    Med. Format RF
    Thanks, Tom.