Your grapes have turned the alcohol into acetic acid...that's why it smells of vinegar.Joe said:Hi Jerry
A Lutheran church we attend once in a while uses wine, yet offers grape juice also. The Pastor is a good friend of mine.
They have communion weekly.
We have a few batches of concord grapes growing in our backyard. Right now, they are mostly bare but have some new green leaves on them.
Due to these alcohol threads, I placed these concord grapes in several tupperware containers and dated them. All you get after months is the stinky smell of vinegar. Can't think of any other way to describe it, but there was no alcohol content. Grapes don't automatically begin to ferment as this article states. Or that wasn't the case with my grapes.
Did you squeeze the juice, or just put the grapes whole into the container? Did you seal the container allowing no oxygen?