There is no clear medical literature documenting that washing gray hair with Drynaria will turn it black. However, it can be used internally to treat premature graying of hair caused by deficiency of yin in the liver and kidney. Dry lotus herb is generally referred to as ink dry lotus, which is cold in nature, sweet and sour in flavor, and mainly goes to the liver and kidney meridians, with the effect of tonifying the liver and kidney, cooling the blood and stopping bleeding. It is mainly used for the treatment of Yin deficiency of the liver and kidney, symptoms such as dizziness, loose teeth, soreness and weakness of the waist and knees, deafness and tinnitus, premature whitening of the beard and hair (adolescent gray hair), vomiting blood, hemoptysis, blood in stools, blood in urine, metrorrhagia (excessive menstruation or more than a few drops), bleeding from wounds, blood dysentery (dysentery with blood in the stool or blood), and so on. In addition, the “Compendium of Materia Medica” recorded that it can “black hair, benefit kidney yin”, “Simple Essentials” recorded that “the treatment of deficiency and loss of all diseases, long service hair white and then black, return to old age”. Ancient medical literature has not clearly documented the use of dry lotus herb to wash white hair will turn black hair. However, it should be noted that the weak spleen and stomach, kidney qi cold people prohibited, allergic to the product is prohibited. Modern clinical research has shown that dry lotus herb can treat baldness, seborrheic dermatitis, coronary heart disease, angina pectoris and other diseases. There is no clear medical literature stating that washing gray hair with dry lotus herb will turn black hair. It is recommended that patients consult a professional medical institution before use, do not use blindly to avoid adverse reactions.