Paul Signac: Quotes about colors

“Of the three primary colors, the three binary ones are formed. If you add to one of these the primary tone that is its opposite, it cancels it out. This means that you produce the required half-tone. Therefore, adding black is not adding a half-tone, it is soiling the tone whose true half-tone resides in this opposite me have just described. Hence the green shadows found in red. The heads of the two little peasants. The yellow one had purple shadows; the redder and more sanguine one had green ones.”

Paul Signac

Quoted by Maria Buszek, online - note 19 http://mariabuszek.com/mariabuszek/kcai/Expressionism/Readings/SignacDelaNeo.pdf
The notebook where this sentence appears was only published, in facsimile, in 1913 by J. Guiffrey. Signac therefore must have consulted it at the Conde Museum, in Chantilly. This Moroccan travel document was bought at the Delacroix sale by the painter Dauzats for the Duc of Aumale.
From Delacroix to Neo-Impressionism, 1899

Color

“It seems that the first consideration of a painter who stands before the white canvas should be to decide what curves and arabesques should cut the surface, what tints and tones should cover it... Following the precepts of Delacroix he would not begin a composition until he had first determined its organization. Guided by tradition and by science, he would adjust the composition to his conception, that is to say he would adapt the lines (directions and angles), the chiaroscuro (tones), the colors (tints), to the traits he wished to make dominant.”

Paul Signac

Chapt. III.; as quoted by John Rewald, in Georges Seurat', a monograph https://ia800607.us.archive.org/23/items/georges00rewa/georges00rewa.pdf; Wittenborn and Compagny, New York, 1943. p. 21
From Delacroix to Neo-Impressionism, 1899

Color , Science

“Divisionism is a complex system of harmony, an aesthetic rather than a technique.
The point is only a means.
To divide is to seek the power and harmony of color, through representing colored light by pure elements, and through employing the optical mixture of these pure elements, separated and proportioned according to the essential laws of contrast and graduation.”

Paul Signac

As quoted in: Catherine Bock-Weiss. Henri Matisse and Neo-Impressionism, 1898-1908, Nr. 13 UMI Research Press, 1977. p. 20
From Delacroix to Neo-Impressionism, 1899

Law , Color , Light