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  1. #21

    Join Date
    Jul 2010
    Southern USA
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    The Anchell & Troop book may be a bit alarmist about the D-76 problem. While the oxidation of hydroquinone causes an increase in pH with an increase in acrivity of the developing agents this is counter balanced by the loss of some of the hydroquinone with a decrease in activity. So the two effects balance each other out. Remember replenished D-76 systems can be used for long periods of time. The only limiting factor is the increase in bromide released during development.

    Hydroquinone is unlike other developing agents in that its oxidation product the hydroquinone monosulfonate ion is also a developing agent. Albeit a weaker one. In fact Kodak sold the potassium salt as Balanced Developing Agent #1 for many years to season new batches of MQ developers.
    Last edited by Gerald C Koch; 02-22-2013 at 01:01 PM. Click to view previous post history.
    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

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