<<Disclaimer: Verify this information before applying it to your situation.>>
Here's a link:
http://www.fda.gov/ora/compliance_ref/cpg/cpgfod/cpg525-825.html
Note that the first category listed is for VINEGAR, CIDER VINEGAR, APPLE
VINEGAR and says, in effect, that an ingredient listed as any of those
three must be "made by the alcoholic and subsequent acetous
fermentations of the juice of apples".
--
Linda Blanchard
http://www.nowheat.com
Midland, Texas