Fe₃[Fe(CN)₆]₂, known as Prussian blue, is a complex compound made up of iron and cyanide ions. It consists of three iron (Fe) ions and two ferrocyanide ions, which are represented by the formula [Fe(CN)₆]²⁻. This compound is notable for its deep blue color and is often used as a pigment in paints and dyes. In addition to its artistic applications, Fe₃[Fe(CN)₆]₂ has important uses in various fields, including medicine and environmental science. It can act as an antidote for certain types of heavy metal poisoning and is also employed in the removal of radioactive isotopes from contaminated water.