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  1. #1

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    Weston Diploma question

    I've been using Weston Diploma and notice when my Potox is hotter than 120 degree is looks like it defeats the sizing in the sheet and completely saturates its. I haven't noticed any adverse effects other than the final dried surface may loose some of its smoothness and it doesn't dry as flat. Are there going to be any other long term adverse archival effects of this? Should I avoid this? I like very warm images so like my developer hot.
    Thanks,
    Ike

  2. #2
    wilsonneal's Avatar
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    This is what I noticed as well, and ultimately it's why I stopped using it.
    n

  3. #3
    Robert Hall's Avatar
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    Same here.
    Robert Hall
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    Technology is not a panacea. It alone will not move your art forward. Only through developing your own aesthetic - free from the tools that create it - can you find new dimension to your work.

  4. #4
    clay's Avatar
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    I use this paper for workshops because it is so forgiving. But the last thing I want is newbies slopping around hot developer, so I always use cold-bath developer, which will give you very nearly the same warmth as hot pot-ox even though you keep it in a tray at room temperature. The only downside to this developer is that it gets murky and black a lot more quickly than regular pot-ox, so I end up tossing it sooner. But if you make your own developer from potassium carbonate and oxalic acid, all you need in addition to make cold bath is some potassium phosphate monobasic. The cool temperature of the developer will keep your sizing from being fried.
    I just want to feel nostalgic like I used to.


    http://www.clayharmon.net - turnip extraordinaire

  5. #5

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    Perfect Clay, will give this a try!
    Ike

  6. #6

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    Do you have a formula for the cold bath ?

  7. #7
    clay's Avatar
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    I will look this up tonight and confirm, but I am pretty sure that it is :

    150g potassium oxalate
    75g potassium phosphate monobasic
    and water to make 1 liter of developer

    Normally I just mix up all my potassium oxlate developer from scratch, so i have a lot of it in a gallon jug. Its nominal composition is 250g of potassium oxalate per liter. 150/250 = .6, so I add 600ml of regular pot-ox (already mixed) 75g of the potassium phosphate monobasic and then top off to 1 liter of solution.

    Will double check all this tonight at the house.

    Quote Originally Posted by deisenlord View Post
    Do you have a formula for the cold bath ?
    Last edited by clay; 09-17-2007 at 05:30 PM. Click to view previous post history.
    I just want to feel nostalgic like I used to.


    http://www.clayharmon.net - turnip extraordinaire

  8. #8
    clay's Avatar
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    I was off slightly. I have edited the formula with the 'correct' proportions. Although you would be surprised at how insensitive this process is to things like developer dilution.
    I just want to feel nostalgic like I used to.


    http://www.clayharmon.net - turnip extraordinaire

  9. #9
    billschwab's Avatar
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    Thanks for this Clay!

  10. #10

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    Hi Clay,

    Does the PO formula with pot phosphate monobasic change the contrast & printing speed as compared to standard PO?

    Also, what is the formula to mixing my own PO from Potassium Carbon & Oxalic acid? Do they need to be lab grade? I remember a post not too long ago but couldn't seem to find it.

    Thanks a million.

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