I recently finished my first batch of wine this winter. It came out relatively well, however, I have discovered one very odd side effect from consuming it. It has the peculiar ability to turn stool to a shade of green. It sounds absurd but i can assure you this is no joke and was observed by others as well. I have no idea why this would be. The closest thing I could find on the internet was the same occurance from consuming grape koolaid. This batch was from welches 100% concord concentrate. The only things added were sulfite, sugar, nutrient, oak chips, and sorbate. There have been no other side effects, and this can only be observed with a reasonable amount of wine (upwards of 2-3 glasses.) This isnt a huge issue, i would just like to know if anyone could shed some insight onto this oddity.