Does vinegar need to be refrigerated after being opened? So while wandering around our local Asian supermarket here in San Diego, my wife and I found some Wan Jia Shan red vinegar.  My wife loves the taste of vinegar, and so we have about 9-10 different types of vinegars at home.  Then we noticed on the bottle that it said to refrigerate the vinegar after opening.  I had never heard this before, and though that this would be a good question to ask.  

So does vinegar need to be refrigerated after opening?  Thanks in advance.
If in doubt, follow the instructions on the label - since this is a vinegar with extra flavoring, all speculation on whether it could spoil (by oxidation of flavor compounds) or even become unsafe to consume is just that: speculation.

Also, make sure that vinegar is stored with the lid down tight if not refrigerated: Asian bottles are often badly designed (caps that tend to stay half open or not seal well), and a half-open vinegar bottles can attract fruit flies and similar surprises into it.