Morning, (at least it is right here and now.)
Just a word of caution on supermarket juices. Before adding
sulfite or acid, do a so2 test and a ta test. I tried some Knots Berry
farm frozen juices (bought at Costco). I decided to check the SO2 on
the stuff before adding any sugar, sulfite and acid blend, and found
the juice to already be over 100ppm. Nothing on the label about that
either. So delute the juice according to the recipe directions, check
the numbers then add stuff according to the numbers.
Just my 0.02 worth of advice.
JAM