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  1. #11
    desertrat's Avatar
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    Deleted - The washing soda addition has already been mentioned.
    Last edited by desertrat; 04-18-2012 at 11:35 AM. Click to view previous post history.
    Happiness is a load of bulk chemicals, a handful of recipes, a brick of film and a box of paper. - desertrat

  2. #12
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    Quote Originally Posted by desertrat View Post
    Deleted - The washing soda addition has already been mentioned.
    How exactly does the washing soda help D-76 (or Ilfotec-HC) develop prints better? Can you recommend an amount? I read roughly a tablespoon per liter (mix and match measuring systems!)

  3. #13
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    Quote Originally Posted by pstake View Post
    How exactly does the washing soda help D-76 (or Ilfotec-HC) develop prints better? Can you recommend an amount? I read roughly a tablespoon per liter (mix and match measuring systems!)
    The sodium carbonate makes the solution more alkaline, and thus more active. A print developer like Dektol has the developing agents metol and hydroquinone in roughly similar proportions to D-76, but uses the more alkaline sodium carbonate as the accelerator. If you add sodium carbonate to D-76, it becomes the accelerator because it's more alkaline than borax, and the borax sort of just goes along for the ride. The formula becomes similar to Dektol as far as the important ingredients are concerned. D-76 has a lot more sodium sulfite than Dektol because the extra sulfite is needed to give the silver solvent property that helps D-76 achieve fine grain. It also helps preserve the D-76 stock solution for a fair amount of time. All the extra sulfite probably won't have much effect on how your 'accelerated' D-76 develops prints, because they won't be in the tray long enough for the silver solvent property to take effect. It will probably make for longer tray life, though. You can probably dilute your D-76 1:1 before adding the sodium carbonate and it should still work. A teaspoon or two of sodium carbonate should work, but a tablespoon shouldn't hurt anything. Try 1 to 2 minutes developing time for your prints. If developer fog occurs, try reducing the amount of sodium carbonate to 1 teaspoon per liter of developer.
    Happiness is a load of bulk chemicals, a handful of recipes, a brick of film and a box of paper. - desertrat

  4. #14
    pstake's Avatar
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    Very helpful information. Thanks desertrat.

  5. #15

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    Quote Originally Posted by Thomas Bertilsson View Post
    I've used accordion bottles for six years now, and don't consider them useless. But I don't use them for long term storage. However, they are very good for shorter term storage, say a couple of months, if you use it for stock solution for replenished film- and paper-developers.
    Say I mix a 5 l kit of Xtol, I put two liters in an accordion bottle, and the rest in 1 l glass amber jars. When the Xtol stock is about half empty in the accordion bottle, I fill it up with one of the liter bottles, and continue indefinitely. I do the same with replenished Ethol LPD, and never had a single problem with failing developer.

    I'm just saying that they do have a purpose, and are therefore not useless. I agree they are not suited for long term storage.

    - Thomas
    Fair enough; I might use them for fixer if I had any accordion bottles, but not for dev. YMMV. :-)
    Cheers,
    kevs.
    testing...

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