Light powder can be used externally to astringe sores, kill worms, attack poison; internal use can be water laxative, no treatment for gray hair; vinegar is food, also no treatment for gray hair. Light powder is toxic, pungent and cold, belonging to the small intestine and large intestine meridian. External use is generally can treat eczema, sores and ulcers, rosacea, scabies, itching, syphilis and so on. Taken internally, it can treat incontinence, edema and distension. Because the drug may lead to mercury poisoning, so internal use needs to be careful, pregnant women and weak body can not take. Vinegar and light powder used together does not have the efficacy of treating gray hair, improper use may lead to poisoning. For gray hair, you need to consult a doctor in a timely manner, you can not take the drug at will, taking drugs need to be guided by a doctor.