Richard and John have both mentioned developing a print to finality, or completion. In his book "Elements" Barry Thornton described this notion as an old wife's tale. His method was to use Acuprint at 1+6 and give enough exposure to get the required print density after 75 seconds in the developer. He stated that a print left longer in the developer would simply carry on gaining unwanted overall density for up to 10 minutes, when fog would set in.
His factorial adjustment for developer that was losing its potency was to increase exposure time - but still stick to development for 75 seconds.
Alan
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