Phenol (also known as carbolic acid, benzenol, hydroxybenzene, and phenic acid, amongst others) is an organic compound with the formula C6H5OH. It is a naturally occurring substance that is found in organic matter and animal wastes but is now manufactured for commercial use. The major uses of phenol, consuming two thirds of its production, involve its conversion to precursors for plastics. Pure phenol is a colourless-to-white crystal which can darken on exposure to light, however the commercial product is a colourless, mobile liquid. It is moderately soluble in water and has a distinctive, sweet, carbolic odour.