After drinking wine, the cup is filled with very weak hot tea, and the water turns green. Who can tell me what the reaction process is? Is it poisonous? thank you

Wine contains anthocyanins, which turn red in acid, blue in alkali and green at about ph8. You can drop some white vinegar, and it will turn red immediately. Hehe, it is the reaction of acid-base indicator, and it is not toxic. You can use it safely. I can give you a trick to identify whether anthocyanins are artificially added, which good quality wood pulp papers can be matched with each other, and then drop wine on them and watch the spread. If,