Benzophenone is a colorless prismatic crystal with sweet taste and rose fragrance. It has a melting point of 47-49°C, a relative density of 1.1146, and a refractive index of 1.6077. It is soluble in organic solvents and monomers such as ethanol, ether and chloroform, but insoluble in water. It is a free radical photoinitiator, mainly used in free radical UV curing systems, such as coatings, inks, adhesives, etc. It is also an intermediate for organic pigments and fragrances.