you mean it started out green and somehow turned brown? you're not looking at the big bloom are you? sorry to ask that but you never know. tiger bloom should definately be a nice radioactive green color. if it turned brown i wouldn't use it. what ever changed its color likely changed the chemical makeup of the liquid. big bloom on the other hand is hen shit brown and turns water cloudy. maybe you switched the caps, but that still shouldn't make it brown like that. buy a new bottle, or if you really think something was wrong with the batch maybe you could make a fuss at the store you bought it from. never hurts to try.