Your detox foot pads turn brown?

if you're talking about the Kinoki foot pads that they advertise on TV, don't fall for it. Those foot pads that supposedly are rid your body of toxins are a complete scam. They conducted an experiment with them and it revealed that if the pads are held next to ANY warm surface- ranging from your feet even to a tea kettle- they will turn brown or black, making you think that the pad is getting rid of the toxins. So when they say on the commercial that you can keep ordering more pads until you no longer have toxins being released from your body, you just end up shelling out hundreds of dollars a month for no reason because the pads will never stop changing color. DON'T FALL FOR IT!!