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Potassium ferrocyanide is red coloured inorganic compound with formula K4[Fe(CN)6]·3H2O. Potassium ferrocyanide finds many niche applications in industry. It is widely used for purification of tin and the separation of copper from molybdenum ores. Potassium ferrocyanide is used in the production of wine and citric acid. In the laboratory, potassium ferrocyanide is used to determine the concentration of potassium permanganate. it is used as an identifying reagent for iron in labs. Potassium ferrocyanide can be used as a fertilizer for plants.

Molecular Sieves are syntheic zeolite, are hydrated metal alumino-silicates crystalline. A Molecular Sieve is a material with pores (very small holes) of uniform size. These pore diameters are similar in size to small molecules, and thus large molecules cannot enter or be adsorbed, while smaller molecules can. Molecular Sieve be used as a catalyst carrier, the co-adsorption of water and carbon dioxide and co-adsorption of water and hydrogen sulfide gas and is mainly applicable to dry of medicine and air compression systems.

Citric Acid is colourless, weak organic acid with chemical formula C6H8O7. It occurs naturally in citrus fruits. It is used widely as an acidifier. It is very soluble in water. Citric acid anhydrous is non-toxic and has a low reactivity. It is chemically stable if stored at ambient temperatures. Citric acid anhydrous is fully biodegradable and can be disposed of with regular waste or sewage.