Odin wrote:
Hmmm....iirc coffee gets poisonous once you reheat it, or something. KennyR's bound to know and explain.
It doesn't get poisonous, it just tastes like filth. Reheated coffee? Yeurghh!
(And the scientific explanation is that the subtle aromatic carbohydrates and hydrocarbons that give coffee its distinct flavour either vapourise and are lost, or oxidise and become rancid, when the coffee is left too long).