- #36
CEL
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From http://skeptoid.com/episodes/4101
The active ingredient in Kinoki footpads is powdered wood vinegar. When it's dried, it forms a colorless powder. In its normal liquid state, it's dark brown or black. Contact with perspiration from your foot reconstitutes the acetic acid in the wood vinegar, and the dark liquid stains the pad. Presto, science in action, and no magical transport of mysterious "toxins" through non-permeable skin is needed to explain the effect.