I've always reheated leftover coffee in the pot by turning the power on and waiting for it to warm up. The other day a friend of mine told me that it really doesn't heat the coffee up, rather it turns on and acts like it's making coffee although there's nothing in there, and the coffee just so happens to get warm. I was wondering, is it ok to reheat leftover coffee in the coffee pot by turning the power button on?
I read that reheating old coffee decreases flavor because the oils are activated or some scientific thing. So what's the best way to reheat coffee?