I defrosted a couple bags of muscadines yesterday to make a 1 gal batch. I crushed the in a zip loc bag and poured all the juice in a sanitary bucket. The hulls i put in a nylon bag and squeezed them again. I crushed some camden tablets and pitched in the juice. My juice before the tablets was a beautiful deep red and when the crushed power from the camden was pitched all the juice turned green. WHAT THE HECK HAPPENED.
The only time I’ve ever seen a color change like that is when I’d add cleaner to a red wine fermenter after racking. I can’t remember if it’s the alkaline or the oxygen cleaner but one of them will react to turn the juice blue/green. Are you absolutely sure you rinsed all the cleaner out completely. Other than that I really can’t come up with anything. It is a chemical reaction though.
Good Luck. :?