Color (n.) is an action, not a thing. It is not fixed as a noun, with properties and differences... instead, it acts as a verb: Yellow can 'redden' and red can 'yellow'.
Color (n.) is light's suffering and joy.
Color (n.) is part of things themselves, in their very essence, and light and shade are states of matter itself.
A Color (n.) is the deed of light, its deeds and sufferings.
Color (n.) is itself a degree of darkness.
Color (n.) is necessarily both in external nature and in our own eye.
Color (n.) is that to which all that is alive tends (i.e. individuality, specificity, effectiveness and opacity) while all that is finished with life inclines toward knowledge, abstraction, generality transfiguration and transparency.
Color (n.) is nothing other than the deeds and sufferings of light.
Color (n.) is a language, and like all languages, much rests in interpretation and translation.
Color (n.) addresses at once the eye and feelings. Each color produces a distinct impression on the mind.
Color (n.) is comprehended in the marriage of polarities by separation and contrast, by commixture and union, by augmentation and neutralization, by communication and dissolution.
Color (n.) is physiological, originating in the eye and belonging to the subject, the individual, and to the eye itself.
Color (n.) is not something that already exists in sunlight, rather it arises from the conduction of polar opposites (like along the fringes of a sharp black/white edge).