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  1. #11

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    Sorry about that. I was referring to Haist's version of D76.

  2. #12
    BradS's Avatar
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    I too have always wondered about the decision to use Hydroquinone. Although it has some appealing chemical properties and the molecule itself is quite beautiful, I think the choice may have been driven by cost considerations but that is pure speculation.

  3. #13

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    Metol and hydroquinone form a superadditive pair but in a low pH developers its main function is to regenerate the metol. This can be seen in Haist's D-76H where the developer works like regular D-76 but without the hydroquinone has a lower capacity.
    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

  4. #14
    Ian Grant's Avatar
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    Quote Originally Posted by Michael R 1974 View Post
    Sorry about that. I was referring to Haist's version of D76.
    Haist was most likely referring to the 1927 Kodak Fine Grain formula as he knewq Kodak had a Metol only developer similar to D76.

    Ian

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