硫酸铜又名蓝矾、石胆,为透明深蓝色结晶或粉末,在空气中慢慢风化,易溶于水,水溶液呈弱酸性,有收敛及较强的杀灭病原体作用。硫酸亚铁,又名绿矾、青矾、皂矾,为透明淡绿色结晶或粉末,味咸涩、带金属性,在干燥的空气中易风化,易溶于水,水溶液呈中性,在潮湿空气中或水溶液放置过久都易氧化水解,生成黄褐色不溶性碱式盐,使溶液呈酸性,不能再供药用。 Copper sulfate, also known as blue alum, stone gall, is a transparent dark blue crystal or powder, slowly weathering in the air, soluble in water, aqueous solution was weakly acidic, convergent and stronger to kill the role of pathogens. Ferrous sulfate, also known as green alum, blue alum, soap alum, as a transparent light green crystal or powder, salty astringent, with metallic nature, easy to weathering in dry air, soluble in water, neutral aqueous solution, at Moist air or water solution for too long are easy to oxidative hydrolysis, generate brown insoluble alkali salts, the solution was acidic, can no longer be for medicinal purposes.