Hello, bamboo vinegar is actually bamboo vinegar powder, which will turn black when wet. This is a normal physical phenomenon, and the above situation will occur as long as it is used. Therefore, it is not possible to judge whether it is effective through this color change, but it is more accurate to judge through physical changes.

You need to know that the principle of foot patch is actually very simple, just like doing foot massage. Massage is to press the acupoints of the foot patch through the knuckles, and the foot patch is to stimulate the acupoints of the foot patch through the medicine bag, dredge the meridians, promote blood circulation, enhance excretion and body metabolism, and achieve the purpose of expelling toxins and eliminating dampness, with fewer natural problems. That's it. Suggest rational use of foot stickers, not superstitious, I hope it will help you.