They are allowing some time for the dissolved Oxygen to be "used up". One has to keep in mind the amount of dissolved Oxygen is quite variable depending on whether the water is coming out of a tap strongly aerated vs out of a bottle etc. Further, there could be several mechanisms at work with dissolved Oxygen. This is why on balance, I would have to say anyone worrying about this is likely trying for some kind of tolerance well within the margin of error. If it were a problem of any materiality it would be addressed in the mixing instructions. Neither Kodak (D-76) nor Ilford (ID-11) indicate a stand period is necessary.
I will also check Haist tonight as D-76 is an example given in the mixing chapter.
Last edited by Michael R 1974; 03-04-2013 at 05:02 PM. Click to view previous post history.