Used as a photosensitive agent in blueprint printing and photographic processes due to its light-sensitive properties. When exposed to UV light, it undergoes photoreduction, forming iron(II) oxalate, which is useful in creating detailed patterns on paper or other media. Also employed in analytical chemistry as a reagent for detecting and quantifying certain metal ions. Its ability to form stable complexes makes it valuable in dyeing and textile industries as a mordant to fix colors on fabrics. Additionally, it finds use in some specialty chemical syntheses where controlled release of iron or oxalate ions is required.