What caused my muscadine wine to turn to vinegar? i only had two & a
half quarts & when i went to check on it a few days ago it had this
thick,slimey grease like film over it.I removed it & it smelt like it
did when i bottled it, today for some reason i checked it again & tasted
it,,it smelled & tasted like vinegar.Why?

Thanks
Willie

ps. I also have five gallons of pear wine fermenting,when i bottle
it,how do i keep it from turning to vinegar?