These are some Frequently Asked Questions about vinegar:

Q. How long does vinegar last?
A. It is believed that when stored properly, vinegars could last indefinitely. However, Pompeian suggests 2 years and offers a "Best By" date which is stamped on the top of the bottle cap. The acid nature of vinegar is self-preserving and does not need refrigeration.

Q. What is mother of vinegar?
A. It is an opaque cellulose (a natural carbohydrate) which is naturally produced by the harmless vinegar bacteria. Pompeian pasteurizes its vinegar before bottling to prevent mother from appearing while sitting on grocery store shelves. However, it may appear in vinegar that has been opened for an extended period of time and there is some non-fermented sugar and/or a trace of alcohol. It is completely harmless and the surrounding vinegar does not have to be discarded because of it. It can be ignored or filtered out using a coffee filter.

Q. Do Pompeian Vinegars contain any alcohol?
A. It is possible for wine vinegars to contain a trace of alcohol, but based on FDA guidelines our vinegars are considered alcohol free.

Q. As with other vinegars, can balsamic vinegar be used for pickling?
A. Balsamic vinegars are not recommended for pickling or herb infusion purposes.

Q. What vinegars, if any, contain sulfites?
A: Generally, true grape wine vinegars, including balsamic vinegar, contain sulfites.

Q. Are Pompeian Vinegars gluten free?
A. Yes.