1, the ingredients of true foot stickers are generally light brown, which will naturally change color when exposed to water, just like the packets cooked in the pot at ordinary times. There are pepper and aniseed in the bag, both of which are dark, so the bag will turn black naturally when it meets water.
2, good foot paste powder is generally light brown bamboo powder, and inferior foot paste is generally in the oil fume refreshing water.
3. After the foot patch is used, it will generally turn black and give off oil. This is a normal physical phenomenon, not the detoxification phenomenon mentioned by many fake foot stickers. There are oily ingredients in the foot patch, just like cosmetics, which can promote absorption.
4. Foot patch can stimulate the acupoints on the soles of feet, enhance blood circulation and promote excretion. This effect can indeed achieve the effect of detoxification, but it will not suck the toxicity or oil out of the soles of the feet. It is suggested to use the foot patch reasonably, not blindly.