Quotes, 1881 - 1890, Letter to Maurice Beaubourg', August 1890
“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.”
            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
        
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Paul Signac 9
French painter 1863–1935Related quotes
                                        
                                        (Manuscript, 1914); as quoted in Futurism, ed. Didier Ottinger; Centre Pompidou / 5 Continents Editions, Milan, 2008, p. 148 
Futurist Manifesto of Men's clothing,' 1913/1914
                                    
                                        
                                        shadows that follow very strict rules 
Quote from  Maria Buszek, online - note 22 http://mariabuszek.com/mariabuszek/kcai/Expressionism/Readings/SignacDelaNeo.pdf 
Seurat's quote from: Jules Christophe, Seurat, in 'Les Hommes d'aujourd'hui', no. 368, March-April 1890 
From Delacroix to Neo-Impressionism, 1899
                                    
                                        
                                        29 April 1854 (p. 228) 
1831 - 1863, Delacroix' 'Journal' (1847 – 1863)
                                    
Source: 1905 - 1910, Notes d'un Peintre' (Notes of a Painter) (1908), p. 411
“Only a persuasive tone can kill two birds with one stone.”
““No doubt the fault was mine,” said the Professor, in a tone that implied the opposite.”
Source: The Brass Bottle (1900), Chapter 3, “An Unexpected Opening”