Ferrocyanide is a chemical compound that consists of iron and cyanide ions. Its formula is K4[Fe(CN)6], indicating that it contains four potassium ions, one iron ion, and six cyanide ions. Ferrocyanide is often used in various applications, including as a pigment in paints and as a reagent in chemical analysis. In its solid form, ferrocyanide appears as a yellow or orange crystalline substance. It is important to note that ferrocyanide is relatively stable and less toxic compared to other cyanide compounds. This stability makes it useful in industrial processes and in the production of certain types of dyes and inks.