I have used sugar to sweeten things and it usually works.
Lemons - Yes Limes - Yes Blueberries - Yes(they get tart when they are overripe and most overripe blueberries are used for blueberry juice) Grapefruit - Yes
However with cranberry juice the sugar dissolves but doesn't sweeten the juice. A few more tablespoons of sugar, no change.
I have had sweetened cranberry juice before when I was young and I don't like cranberries or pomegranates by themselves. However cranberry pomegranate always is sweet(which I can't believe since sour + bitter does not usually equal sweet).
So is there something in cranberry juice that changes the sugar so that it is inactive or something(I use just sugar and juice, no water or extra acid or anything else)?
I just can't sweeten cranberry juice for some reason. I think it has to do with the difference in the acid(but then again blueberries have a different acid than citrus fruits and blueberry juice can be sweetened just fine). Is it a difference in the acid or what?