OK, I have decided not to try these after reading ShakespeareMamaX's post above. I have a strong feeling that the people who were helped by the Kinoki pads had a placebo effect.
When I went to the links provided by SMX, one of the comments was:
"They had an expert doctor on [a TV program] saying that these pads are treated with vinegar which turns black after contact with perspiration. Mystery solved!"
Also, other comments were that if they poured water onto the pads, the pads changed to black. So, it seems that perspiration or water turn the pads black.
Thanks, SMX!
sue