《天工开物·中篇·燔石》
此外，用干燥的明矾粉末撒在患处，能治疗流出臭水的湿疹和疱疮等病症，因此也是皮肤科急需的药品。
其末干撒，又能冶浸淫恶水，故湿疮家亦急需之也。
In addition, applying dry potash alum powder to the affected area can treat eczema with stinky discharge and blisters and is badly needed in dermatology.