Shelf-life: Verjus

[NYChristopher]

A few years back I bought a small bottle of verjus (375 ml). I never got around to using it (bad, I know) but now that I'm looking at it, I'm wondering: how long before verjus goes bad?

I seem to recall a fairly clear, pale color ... now it's turning amber as Sauternes would.

For those wondering what the heck I'm talking about ...
http://www.chow.com/stories/10054

Thanks!

[Brandon Nelson]

Verjus is pretty acidic. Acid is a preservative. It may be just fine.

[NYChristopher]

Actually, the link I provided said it's NOT acidic. I'm embarrassed to admit I've not used the stuff before so I really have no idea personally.

[JoanN]

Unopened, it should last a year or two. Once opened, I find that although online references tell me it should last a couple of months in the fridge, it seems to me that it begins to deteriorate after a couple of weeks. It's still usable, but no longer as fresh and bright as it was originally. I buy and serve it as a wine substitute, either with or without a splash of club soda, for friends who don't drink alcohol. If the bottle hasn't been emptied, I use the verjuice in place of of vinegar or lemon juice for simply wonderful salad dressings. But after a few weeks, at least in my estimation, it loses that charming brightness and starts to turn into ordinary, but still usable, vinegar.