Ooops, meant to respond....I listened...
Basically, they said it's a big FAKE!
They said, certain chemicals are already in those products such as zinc, etc (so there's your's zinc).
Your body NATURALLY emits toxins via Feces, sweat and Urine... and via the usual ways. It would not emit through your feet.
Regarding the changing color of the pad: They believe that anything such as sweat etc, can reat with the chemicals in the pad to change it colors. For example: they put the foot pad over a boiling water emitting steam: The foot pad turned Black. (suppossedly when it turns colors (gray, black, etc) then the toxins are leaving your body).
So there's the 411. Don't buy Konoki Foot pads.
Now, Ped Egg, a whole nother story...that DEFINITELY works!