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It is almost certainly a fermentation - opened juice does not keep for a week in the fridge. So you got some bacteria in it which are creating tangy byproducts (lactic or acetic acid). It is a method of creating fermented drinks such as cider (or even fruit wine), but without following a tested process, you cannot be sure if some of the bacteria may be ...


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What is it? In particular, what acid might I be tasting? Could be all kinds of stuff. In any event, you can be almost certain that a changing flavor of unpasteurized OJ is due to something not very healthy. Example literature. If you really like the acidic flavors, consider purchasing pasteurized OJ, and then adding Tart Cherry Juice Concentrate. Or even ...



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