formed by the primaries yellow, green, blue and red, and was supported by Alberti in his "De Pictura" (1436 ), using the rectangle, rhombus, and color wheel or color wheel to represent them. Leonardo da Vinci endorsed this model in 1510, although he hesitated to include green, noting that green could be obtained by mixing blue and yellow. Also Richard Waller, in his "Catalogue of Simple and Mixed Colors" (1686), graphed these four colors in a square. These four colors have often been referred to as "the primary psychological colors". Traditional coloring with three primaries The first known case of trichromatic coloration (of 3 primaries) can be found in a work on optics by the Belgian thinker Franciscus Aguilonius in 1613, who in his "Opticorum libro sex, philosophis iuxta ac mathematicalis utiles" in Latin, graphed the colors flavvus, rvbevs and cærvlevs' ' (yellow, red and blue) giving rise to the intermediate colors avrevs, viridis and pvrpvrevs (orange, green and purple) and their relationship with the extremes albvs and niger (white and black). 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. colors. This model was used for printing by Jacob Christoph Le Blon in 1725 and called it Coloritto or harmony of colouring'', stating that the primitive (primary) colors are yellow, red and blue, while the secondary are orange, green and purple or violet. 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. 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 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 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 Chevreul and many others. 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 and CMYK models. See