Sodium ferrocyanide is an inorganic compound, and there are several other names used to refer to it. One of the most common synonyms is sodium hexacyanoferrate (II), and it is also known as yellow prussiate of soda. Another synonym is sodium ferrocyanide decahydrate, which is the hydrated form of the compound and contains ten molecules of water. Additionally, the compound is sometimes referred to as Turnbull's blue, which is a blue pigment that is formed when it reacts with iron oxide. Sodium ferrocyanide is used in a range of industries, including as a food additive, in photography, and in the production of pigments and dyes.