Why does green tea turn red/brown after sitting out?

[Vertimus]

Is it oxidation? (I've never took chem)

BTW, get some green tea, add honey/sugar, and chill it. It's good stuff, plus healthy. IMO, green tea is one herb that isn't overrated.

 

[Bleep]

Maybe the water you used is a little contaminated, try it without any tea.

Bleep

 

[flxnimprtmscl]

I <3 green tea. I probably drink three quarts of the stuff a day. As far as to it changing color, mine will turn a darker yellow but never red/brown. You've got screwed up water.