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  1. #1
    pierods's Avatar
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    d-76 with 75g Sodium Sulfite

    I read in an old book about a reduced Sodium Sulfite d-76, with 75 grams.

    Is it any good? Should I change dev times?

  2. #2

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    there are dozens of formula which are more or less relatives of D-76 with a little bit more or less hydroquinone or metol or sodium sulfite. If you take less sodium sulfite you'll get a little bit more acuteness and a little bit coarser grain since the sulfite has dissolving properties for silver. But it acts also as a weak alkali (D-23 has only metol and sulfite), so maybe you'll have to adapt your times.

  3. #3
    pierods's Avatar
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    Like, more time or less time?

  4. #4

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    The maximum solvency of sulfite for silver halide is at approximately 75 g/l. So this variation shoujld produce the finest grain provided that you use D-76 at full strength.
    A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.

    ~Antoine de Saint-Exupery

  5. #5
    pierods's Avatar
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    Quote Originally Posted by Gerald C Koch View Post
    The maximum solvency of sulfite for silver halide is at approximately 75 g/l. So this variation shoujld produce the finest grain provided that you use D-76 at full strength.
    ??

    Less SS produces coarser grain, isn't it?

  6. #6
    Ian Grant's Avatar
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    Quote Originally Posted by pierods View Post
    ??

    Less SS produces coarser grain, isn't it?
    No there's an optimum point and this is close to 75-80g/l Sodium sulphite, so Adox Borax MQ and Agfa 44 (Ansco Agfa/GAF 17) use this lower amount, as does Ilford ID-68/Microphen. These developers give about 1/3 of a stop more film speed, the first two finer grain as well.

    Ian

  7. #7
    pierods's Avatar
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    Ok, I get the point now. So at 75g/l, I get the finest grain before losing that 1/3 speed.

    Why then d-76 has 100 g?

  8. #8
    Ian Grant's Avatar
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    Quote Originally Posted by pierods View Post
    Ok, I get the point now. So at 75g/l, I get the finest grain before losing that 1/3 speed.

    Why then d-76 has 100 g?

    Because way back in 1926/7 Eastman Kodak Research chose to use 100g/l and this stayed constant in a number of Kodak developers, the first EK Fine Grain developer, D76, D23, D25, DK20 etc.

    Kodak initially began from the Wellington & Ward Buffered Borax developer formula which was known to give finer grain and a series of developers evolved with incresing Sulphite, DK50 is the closest to the W&W dveloper, DK60 & DK60a in between DK50 & D76. There were older versions of both prior to Kodak using Sodium Metaborate.

    Ian

  9. #9
    pierods's Avatar
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    Ok, thanks!

  10. #10
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    I just finished some tests with Kodak D-76 vs the D-76 standard formula:

    Stock vs Stock.

    Kodak D-76 is slightly sharper and grainier, otherwise identical results. Test was on T-Max 100.

    details: http://www.photodan.com.au/2013/04/k...6-differences/


    Kodak D-76: http://www.photodan.com.au/wp-conten...013/04/D76.jpg
    D-76 Standard Recipe: http://www.photodan.com.au/wp-conten...13/04/PC11.jpg
    Last edited by Athiril; 04-11-2013 at 01:56 AM. Click to view previous post history.

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