Sodium ferrocyanide is a chemical compound with the formula Na4[Fe(CN)6]. It appears as a yellow crystalline solid and is commonly used in various industrial applications, including as a food additive and in the production of pigments. It is known for its stability and low toxicity, making it suitable for use in food processing. In addition to its use in food, sodium ferrocyanide is also employed in the manufacturing of blue pigments like Prussian blue and in the treatment of gold and silver ores. Its unique properties allow it to act as a complexing agent in various chemical reactions.