there is no need to be concerned with one-week old stock solution. D-76 keeps for 6 months in a fully stoppered bottle. 2 months in a half-filled bottle. Get the full scoop in Kodak's Tech Publication J-78 here:
I found the key is to look at the color. If they have the same color (clear as I remember) you should have no problems. As you seem to be blowing through the stuff quick enough I don't think it should be a problem. If I remember right, when developers get older they oxidize and loose power.
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