silver nitrate reaction with sodium chloride in presence of UV Light

When solutions of sodium chloride and silver nitrate are mixed, then a white solid (silver chloride) forms sodium chloride(aq) + silver nitrate(aq) → sodium nitrate(aq) + silver chloride(s) Silver Chloride in presence of UV Light turns grey which is the silver chloride undergoes photochemical decomposition to produce silver metal and a halogen gas This reaction has been used in photography due to the fact that the parts of the image that is exposed to light can be washed away!