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Desert Rat (Phoenix, AZ) on 06/06/2009:
I add about 1/4 teaspoon of 3% H2O2 to a carton of milk when I first open it. Since we slowly go through milk, it helps stop the milk from souring. If I still have the same carton in the fridge in two weeks, I will add a bit more. I have had milk last a month in the fridge without going sour!
