玄明粉和风化硝是芒硝不同方法加工而成的两种药物。而目前药房往往将两者视为一物。其实这是不对的。玄明粉早在《本草蒙荃》中就有记载:“芒硝制作玄明粉,则加萝卜、冬瓜和豆腐共煮,以去其咸。”《医学衷中参西录》也有:“用洁净朴硝十斤、白莱菔五斤切片,同入锅中,用水一斗五升,煮至莱菔烂熟,将莱菔捞出……其硝洁白如粉,轻虚成片。”玄明粉的具体制法是:“将芒硝与萝卜片同煮,使硝全部溶化后,滤除不溶物,溶液冷却后所析之结晶,风化成白色粉末为玄 Xuanming powder and weathered nitrate are two kinds of drugs that are processed by Glauber’s salt in different ways. At present, pharmacies tend to treat both as one thing. This is actually wrong. Xuanming powder has been documented in “Materia Medica Mang”. “The Glauber’s salt produces Xuang Ming powder, and adds radish, wax gourd and tofu to cook it to salty.” Ten pounds and five pounds of white radish slices, with the same pot, five liters of water and one bucket, cook until the broth is overripe, remove the radish, and remove the salty white powder, light and virtual into pieces.” The specific method of making Xuan Ming powder is : “Brown the Glauber’s salt and radish slices to cook, so that after all the nitrates are dissolved, the insolubles are filtered off. The crystals that have been analyzed after the solution cools are weathered into white powder.