Diammonium oxalate, with the chemical formula (NH4)2C2O4, is a highly soluble, white crystalline solid. It plays crucial roles across several industries and scientific fields. In analytical chemistry, diammonium oxalate acts as a potent reducing agent. It serves as a mordant in textile and leather manufacturing, enhancing dyeing processes. This compound is also integral in photography, used in developing solutions. Moreover, in laboratory settings, diammonium oxalate forms complexes with metal ions, facilitating their separation and precise analysis.