Any measurement which has been normalized, adjusted or derived by a mathematical process or computation, of the color of the hair, wool, or fur of an organism, that is, of either a single cylindrical, keratinized, often pigmented filament characteristically growing from the epidermis of a mammal, or of the aggregate of all such filaments. Color is property of a surface or substance due to absorption of certain light rays and reflection of others within the range of wavelengths (roughly 370-760 nm) adequate to excite the retinal receptors.