A 1% ammonium ferric sulfate solution is a dilute aqueous solution of ammonium ferric sulfate, an inorganic salt also known as ferrous sulfate or ferric ammonium alum. This solution has a greenish-blue color and can be used in chemistry and laboratory for various applications. One of the main uses of ammonium ferric sulfate is as an oxidizing agent in the synthesis of organic compounds. In addition, it is used as a precipitating reagent for the quantification of phosphates. In histology, it is used as a component of staining solutions to visualize certain tissue structures and cellular components. The 1% solution is relatively dilute and can be further diluted or concentrated depending on the application.