Potassium ferrocyanide, commonly known as yellow prussiate of potash (K4[Fe(CN)6]·3H2O), is a crystalline powder with a pale yellow color. It is highly soluble in water and non-toxic, making it widely used in various industries. Primarily, it functions as a complexing agent in the production of pigments, especially blues and greens, as well as in dyeing processes. In the food industry, it serves as an anti-caking agent and stabilizer for salt. Potassium ferrocyanide also finds applications in photography as a developing agent and in analytical chemistry for detecting iron ions. Despite its utility, it requires careful handling to prevent contamination and ensure safe disposal due to its potential environmental impacts. Regulations govern its use to mitigate risks associated with its production, handling, and disposal in industrial and laboratory settings.