Acetic acid white test is a common method of identifying warts, the vinegar used in the acetic acid white test is 5% glacial acetic acid, clinically if you do not have 5% glacial acetic acid, 6 degrees of rice vinegar can also be used. The principle of acetic acid white test is human papillomavirus infection, caused by the epithelial cells and normal tissue epithelial cells produce different keratin, papillomavirus infection caused by the epithelial cells can be whitened by acetic acid, so the acetic acid white test is a common method of identifying warts, the diseased tissues will be whitened, and the normal tissues, the cells will not change color.