Editing Primary color (section)

====Criticism====
[[Albert Henry Munsell|Albert Munsell]], an American painter (and creator of the early 20th century [[Munsell color system]]), referred to the notion of RYB primaries as "mischief", "a widely accepted error", and underspecified in his book ''A Color Notation'', first published in 1905.<ref>{{cite book |last1=Munsell |first1=A.H. |title=A Color Notation |date=1907 |url=http://www.gutenberg.org/files/26054/26054-h/26054-h.htm |quote=The wide discrepancies of red, yellow, and blue, which have been falsely taught as primary colors, can no more be tuned by a child than the musical novice can tune his instrument. Each of these hues has three variable factors (see page 14, paragraph 14), and scientific tests are necessary to measure and relate their uneven degrees of Hue, Value, and Chroma.}}</ref>

Itten's ideas about RYB primaries have been criticized as ignoring modern color science<ref name="renzoshamey2020"/>{{rp|282|quote=For a three-dimensional model, Itten ignored the quantitative systems produced by Munsell and Ostwald and used a simple sphere externally resembling the one published by Runge in 1810.}} with demonstrations that some of Itten's claims about mixing RYB primaries are impossible.<ref>{{cite journal |last1=Hirschler |first1=Robert |last2=Csillag |first2=Paula |last3=Manyé |first3=Pablo |last4=Neder |first4=Mônica |title=How much colour science is not too much? |journal=Color Research & Application |quote=One of the most typical problems is that of trying to reproduce Itten's colour circle following his instructions. Students may get frustrated, because it is simply not possible to achieve acceptable results using the RYB 'primaries'. Figure 16 illustrates why it is impossible to reproduce Itten's colour circle following strictly his instructions. |date=December 2018 |volume=43 |issue=6 |page=987 |doi=10.1002/col.22275|s2cid=125461782 }}</ref>