Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 70,938   Posts: 1,557,371   Online: 997
      
Page 1 of 2 12 LastLast
Results 1 to 10 of 11
  1. #1

    Join Date
    Mar 2004
    Location
    New York
    Shooter
    4x5 Format
    Posts
    222
    Images
    42

    Clearing Platinum Prints with Permawash?

    I have had some problems clearing platinum prints using EDTA, even an overnight soaking wasn't enough to remove a yellow cast. Is there a shelf life to EDTA?

    I had a little Permawash in the darkroom, and tried that yesterday, seems to clear the yellow cast in about 15 minutes. Has anyone else used Permawash for clearing prints?

  2. #2

    Join Date
    Dec 2004
    Location
    Minneapolis, MN
    Shooter
    4x5 Format
    Posts
    482
    Images
    14
    Yes, probably the most common clearing agents are HCA and Permawash. I've heard of many problems with straight EDTA, I've used sodium sulfite+EDTA effectively. You need your bath to be acidic.

  3. #3
    Mark Fisher's Avatar
    Join Date
    Dec 2003
    Location
    Chicago
    Shooter
    Medium Format
    Posts
    1,631
    Images
    152
    I had problems clearing Kallitypes and Permawash was the only thing I could get to work reliably.

  4. #4
    TheFlyingCamera's Avatar
    Join Date
    May 2005
    Location
    Washington DC
    Shooter
    Large Format
    Posts
    8,414
    Blog Entries
    51
    Images
    435
    I've always used an EDTA + Permawash bath for clearing my pt/pd. I'm going down to my darkroom in a bit and I'll look up the exact recipe, but off the top of my head it's one tablespoon of EDTA plus 3/4 oz Permawash per liter/quart of water.

  5. #5
    Vaughn's Avatar
    Join Date
    Dec 2006
    Location
    Humboldt Co.
    Shooter
    8x10 Format
    Posts
    4,692
    Images
    40
    I use a dilute bath of citric acid (30 grams in 1500 ml water) for the first bath, then two baths of Kodak HCA (with a little EDTA tossed in). Works for me.

    Last Light, Yosemite National Park
    4x10 Platinum/Palladium Print
    Attached Thumbnails Attached Thumbnails Last Valley Light, Yosemite Falls.jpg  
    At least with LF landscape, a bad day of photography can still be a good day of exercise.

  6. #6

    Join Date
    Mar 2004
    Location
    New York
    Shooter
    4x5 Format
    Posts
    222
    Images
    42
    Thanks everyone, looks like I will be getting some more Permawash.

  7. #7
    donbga's Avatar
    Join Date
    Nov 2003
    Shooter
    Large Format Pan
    Posts
    2,084
    Quote Originally Posted by Vaughn View Post
    I use a dilute bath of citric acid (30 grams in 1500 ml water) for the first bath,
    Last Light, Yosemite National Park
    4x10 Platinum/Palladium Print
    Exactly what Vaughn said. I would add go directly to the citric bath without any intervening water rinse.
    Don Bryant

  8. #8

    Join Date
    Feb 2003
    Location
    Jacksonville, FL
    Shooter
    Large Format
    Posts
    1,647
    Another variation from others: I use 3 baths ( 5 mins each) preceded by brief water rinse.
    1st & 3rd baths are:
    30 grams EDTA (tetra)
    15 grams Citric Acid
    15 grams Sodium Sulfite
    For liter distilled water

    2nd bath - Hypo Clear:
    200 grams Sodium Sulfite
    50 grams Sodium Bisulfite + liter water

    Not sure where I got this, but seems to work fine.
    van Huyck Photo
    "Progress is only a direction, and it's often the wrong direction"

  9. #9
    TheFlyingCamera's Avatar
    Join Date
    May 2005
    Location
    Washington DC
    Shooter
    Large Format
    Posts
    8,414
    Blog Entries
    51
    Images
    435
    I tried going directly to the clearing bath from the developer today - it works. That said, you get a LOT of carry-over from the developer in the clearing bath, which would lead to accelerated exhaustion of the clearing bath. I'm not a big fan of wasting chemicals if I don't have to, and this seems like waste to me. Unless you are having problems with pH that lead to clearing failure, I'd still go with the water wash before the clearing bath. It's similar to going direct from developer to fix for your silver-gelatin prints. You certainly CAN, but you'll exhaust your fix that much faster.

  10. #10
    Vaughn's Avatar
    Join Date
    Dec 2006
    Location
    Humboldt Co.
    Shooter
    8x10 Format
    Posts
    4,692
    Images
    40
    I used a short water bath before the Citric Acid -- perhaps I will not next time. Citric Acid is not too expensive ($52 for 10 pounds...if I needed that amount!) and I can easily make up several baths depending on my output.

    I also rinse the prints between the Citric Acid and the HCA/EDTA...just to get the surface Citric Acid off the paper before the next clearing bath. I tend to do long washes, but I have never measured the pH level of the finished print. Between the Citric Acid, and the presoak of the paper in 3 to 5% Oxalic Acid, I suppose the washed print might lean towards a sub 7.0 pH.

    Vaughn
    At least with LF landscape, a bad day of photography can still be a good day of exercise.

Page 1 of 2 12 LastLast


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin