  Another useful distinction is between the pure and the impure. A property is said to be impure if it is analysed in terms of a relation with some particular substance (e.g., being within a light year of the Sun). Otherwise it is pure (e.g., being within a light year of a star). Those two examples are both of extrinsic properties, but some intrinsic properties are impure, (e.g., being composed of the Earth and the Moon). According to my definitions all non-relational properties are pure.