“The variety of colour in objects cannot be discerned at a great distance, excepting in those parts which are directly lighted up by the solar rays.”
The Notebooks of Leonardo da Vinci (1883), VI Perspective of Colour and Aerial Perspective
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Leonardo Da Vinci 363
Italian Renaissance polymath 1452–1519Related quotes

Source: Sir William Herschel: His Life and Works (1880), Ch.4 "Life and Works" on his discovery of the infrared light.

Internet Encyclopedia of Philosophy

Preface
A Course of Lectures on Natural Philosophy and the Mechanical Arts (1807)

Source: 1932 - 1946, The Studio 132:643', (1946), p. 280

Query 1
Opticks (1704)

Source: A System of Logic (1843), p. 4
Context: [W]e may fancy that we see or feel what we in reality infer. Newton saw the truth of many propositions of geometry without reading the demonstrations, but not, we may be sure, without their flashing through his mind. A truth, or supposed truth, which is really the result of a very rapid inference, may seem to be apprehended intuitively. It has long been agreed by thinkers of the most opposite schools, that this mistake is actually made in so familiar an instance as that of the eyesight. There is nothing of which we appear to ourselves to be more directly conscious, than the distance of an object from us. Yet it has long been ascertained, that what is perceived by the eye, is at most nothing more than a variously coloured surface; that when we fancy we see distance, all we really see is certain variations of apparent size, and degrees of faintness of colour; and that our estimate of the object's distance from us is the result of a comparison (made with so much rapidity that we are unconscious of making it) between the size and colour of the object as they appear at the time, and the size and colour of the same or of similar objects as they appeared when close at hand, or when their degree of remoteness was known by other evidence. The perception of distance by the eye, which seems so like intuition, is thus, in reality, an inference grounded on experience; an inference, too, which we learn to make; and which we make with more and more correctness as our experience increases; though in familiar cases it takes place, so rapidly as to appear exactly on a par with those perceptions of sight which are really intuitive, our perceptions of colour.

Query 20
Opticks (1704)

Students' Text-book of Color; Or, Modern Chromatics, with Applications to Art and Industry. New York: D. Appleton and Company. 1881.

"Hypothesis explaining the Properties of Light" (1675)