Nowadays, most of the foot patches have added dampness-removing ingredients, but in fact, Chinese herbal medicine dampness-removing is a long-term conditioning process. Long-term use of dampness-removing Chinese medicine will not have immediate effect, so the foot patch will not have such obvious effect. What we see is that after using the foot patch, the foot patch turns scary black. In fact, we think it does emit a lot of moisture in our senses, but it is not that useful.
Eliminating moisture in traditional Chinese medicine is a long adjustment process. Because there are many acupoints on the soles of the feet, you can stick foot patches to accelerate blood circulation and stimulate acupoints. Therefore, the foot patch actually helps to slowly change people's physique through such conditioning methods, but in order to let consumers intuitively feel the function of the foot patch, some substances that can absorb water are added to the foot patch, which will turn black when encountering water vapor.
Therefore, some people who use foot patches find that the foot patches turn black after sleeping, thinking that they really discharge a lot of moisture in their bodies. This is actually a misleading, but also a marketing tool. After all, consumers will have the motivation to continue buying when they see the real effect, but the effect is far from so good.
In fact, even if people don't stick foot patches, metabolism will occur during normal sleep, and in this process, the human body will produce sweat or oil. Although we may not realize the existence of such substances ourselves, human skin itself has certain moisture and oil. When the mat comes into contact with such a substance, the added substance will decompose and turn black.
When people see the change of black, they will think it is the contribution of foot stickers. In fact, even if there is no foot patch, the soles of the feet will decompose oil and sweat at ordinary times, but the weight is not enough for people to notice.