
It doesn't seem to do anything at all. Gave the same results when I put my feet in the water and didn't put it down. Most likely the color comes from the iodine in the salt. If you decide to try the experiment, be sure to wash your feet before using it, as it can react to the oils and salts already on your skin, which can increase the salt concentration in the water. from inside your body, not from the surface of your feet.

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