Originally Posted by sam111
but then what is the difference between unpasterized vineger and just letting alcohol exposed to air for a really long time?
Won't the latter turn into semi-vineger but spoil as well over time.
What is different between the 2.
I'm not sure what you mean by "semi-vinegar", but both wine vinegar and wine will go bad - just not in the way that you think. Technically, vinegar doesn't spoil because it's already spoiled. And wine will "spoil" by turning into vinegar.
What eventually destroys both of these products is oxygen. Over time they will turn brown and the flavor will change. It's the same exact process that turns bananas and avocados brown.