a substance that gives something a particular colour when it is present in it or is added to it

Melanin is the dark brown pigment of the hair, skin, and eyes that is present in varying amounts in every human being. 黑色素是头发、皮肤和眼睛中的黑褐色色素，每个人体内或多或少都有这种色素。

Pigment is mixed into oil, glue, egg, etc. to make different types of paint. 将颜料与油、胶水、鸡蛋等混合，制成各种涂料。