Potassium bromide with old paper?please could you explaine?

Discussion in 'B&W: Film, Paper, Chemistry' started by peters8, Jan 24, 2013.

  1. peters8

    peters8 Member

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    Hi friends.
    I bought some old papers box:Oriental New seagull G...Oriental New Seagull G Warmtone...Sterling warmtone...
    Some people said that it's better to add a small part of potassium bromide because in this way the old papers work better.My intentions is use them with lith developer (easy lith by Moersch).
    Please could you explain that,please!
     
  2. brucemuir

    brucemuir Member

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    The pot bromide helps restrain the fog in old papers but I'm not that experienced in this so I know someone else can help.
    With lith I don't know if it's that necessary considering the lith is lower in contrast by mature.

    I'm interested the the answers you get here as well.
     
  3. Mark Fisher

    Mark Fisher Subscriber

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    Those papers aren't that old particularly for lith. Give them a go without. Too much KBr will also stop the lith development. I've heard that Sterling can tend to have pepper fog which is cured with a little sodium sulfite....or so I've heard. I've been searching for some Sterling Lith for awhile.....have fun.
    Also, lith isn't high or low contrast by nature, but has a much larger potential contrast range than regular printing. That's one of the reasons why I love it......
     
  4. peters8

    peters8 Member

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    While if I don't use the lith developer,but I'm using a normal developer...is it better to add a little quantity of potassium bromide in order to remove the fog from the old papers?
    I have a big stock of many old papers (15/18 years old papers)...and i'd like to use them.
    So do you recomend to add potassium bromide to the developer?
    Thanks
    regards
     
  5. Gerald C Koch

    Gerald C Koch Member

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    Try adding 2.5 ml of a 10% solution of potassium bromide per liter to your developer. You can add more in 2.5 ml increments until fog is under control or until about 40 ml of bromide has been added. If there is still noticeable fog then the paper is beyond help.

    You can also use 1% benzotriiazole in place of the potassium bromide.
     
  6. brucemuir

    brucemuir Member

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    Thanks Gerald!
     
  7. peters8

    peters8 Member

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    hi Gerald!are there many differences between potassium bromide and benzotriazole???...a part the price...because the benzotriazole is very very expensive,while the poassium bromide is very cheap.
    regards
     
  8. Gerald C Koch

    Gerald C Koch Member

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    If you are in the US www.techcheminc.com sells 100 g of benzotriazole for $15 plus shipping.
     
  9. ath

    ath Member

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    I would only add a restrainer if necessary. Make a test if the paper is fogged.
    Benzotriazole shifts the colour of the image silver towards cold and KBr towards warm.