Editing RYB color model (section)

=== Traditional coloring with three primaries ===
The first known case of [[Trichromia|trichromacy]] coloration (of 3 primaries) can be found in a work on optics by the Belgian thinker [[Franciscus Aguilonius]] in 1613,<ref>[https://web.archive .org/web/20140213041900/http://www.colorsystem.com/?page_id=629&lang=en Franciscus Aguilonius] Colorsystem. Farbsysteme in Kunst und Wissenschaft</ref> who in his ''"Opticorum libri sex, philosophis iuxtà ac mathematicis utiles"'' in Latin (Roughly, ''Six books of optics: useful to philosophers as well as to mathematicians''), graphed the colors ''flavvus'', ''rvbevs'' and ''cærvlevs'' ([[yellow]], [[red]] and [[blue]]) giving rise to the intermediate colors ''avrevs'', ''viridis'' and ''pvrpvrevs'' ([[Orange (color)|orange]], [[green]] and [[purple]]) and their relationship with the extremes ''albvs'' and ''niger'' ([[white]] and [[Black (color)|black]]).<ref>Francisco de Aguilón, Antwerp 1613: [http://www.fsanmillan.es/biblioteca/francisco-de-aguilon-opticorum-libro-sex-philosophis-iuxta-ac-mathematicis-utiles Opticorum book sex, philosophis iuxta ac useful mathematics, p. 40] {{webarchive|url=https://web.archive.org/web/20150924015734/http://www.fsanmillan.es/biblioteca/francisco-de-aguilon-opticorum-libro-sex-philosophis-iuxta-ac-mathematicis-utils}} San Millán Foundation of the Cogolla p. 84</ref> However, the idea of three primary colors is older, as Aguilonius supported the view known since the Middle Ages that the colors yellow, red, and blue were the basic or "noble" colors from which all others are derived.<ref>{{cite web|title=Color vision: Do "primary" colors exist?|url=http://handprint.com/HP/WCL/color6.html#ancient|access-date=September 1, 2017|language =English|last=MacEvoy|first=Bruce|publisher=Handprint.com|year=2005}}</ref>

This model was used for printing by [[Jacob Christoph Le Blon]] in 1725 and called it ''Coloritto'' or ''harmony of colouring'',<ref>O. M. Lilien, Jacob Christoph Le Blon, 1667–1741: Inventor of Three- and Four-colour Printing. Stuttgart 1985</ref> stating that the primitive (primary) colors are yellow, red and blue, while the [[secondary colors|secondary]] are orange, green and purple or [[Violet (color)|violet]].<ref>{{Cite book|url=https://books.google.com/books?id=-fNJZ0xmTFIC&dq=%22le+blon%22+color+printing&pg=PA6|title=The Science of Color|first=Steven K.|last=Shevell|date=July 11, 2003|publisher=Elsevier|isbn=978-0-08-052322-4 |via=Google Books}}</ref>

In 1766, Moses Harris developed an 18-color color wheel based on this model, including a wider range of colors by adding light and dark derivatives.<ref>Paul Zelanski, Mary Pat Fisher 2001. "Colour" London</ref> During the 18th and 19th centuries, this color model was endorsed by many authors who have left illustrations that can still be appreciated today, such as Louis-Bertrand Castel (1740), the [[Mayer's color theory|Tobias's color system Mayer]] (1758), Moses Harris (1770–76), Ignaz Schiffermuller (1772), Baumgartner and Muller (1803), Sowerby (1809), Runge (1809), the popular "[[Theory of Colors]]" (1810) by [[Johann Wolfgang von Goethe|Goethe]], Gregoire (1810–20), Merimee (1815-30-39), Klotz (1816), G. Field (1817-41-50), Hayter (1826 ), the "Law of Simultaneous Contrast of Colours" (1839) by [[Michel Eugène Chevreul|Chevreul]] and many others.<ref>David Briggs 2013, The Dimensions of Color [http://www.huevaluechroma.com/072.php 7.2 The RYB hu e circle or "artists' color wheel".]</ref>
[[File:Moses_Harris,_Prismatic_Colour_Wheel,_1766.jpg|thumb|upright|Harris's '[[colour wheel]]' showing how a range of colours can be made from red, yellow and blue]]

By the 20th century, natural pigments gave way to synthetic ones. The invention of [[phthalocyanine]] and derivatives of [[quinacridone]], expanded the range of primary blues and reds, getting closer to the ideal subtractive colors and the [[CMY color model|CMY]] and [[CMYK]] models.
[[File:NIEdot367.jpg|thumb|Use in [[printing]] of color books in 1902 through the so-called "tricolor process"]]