<<Disclaimer: Verify this information before applying it to your situation.>>

My original post wondered if anyone knew what "natural flavors" were
being added by some manufacturers of cheap wines that have changed their
labels in the last few months.  No one had specific knowledge of any of
the brands in question, but several people had anecdotal evidence that
suggested possibly fruit juices.

Conclusion:  we have to check with the various manufacturers, but there
is a possibility that we will get "the right answer" in at least some of
the cases.