The Color Kittens The Color Kittens The Color Kittens is a children's book by Margaret Wise Brown, illustrated by Alice and Martin Provensen published as part of the Little Golden Books series in 1949. The story revolves around two kittens, "Hush" and "Brush," who attempt to create green paint through mixing their other paints. Their attempts lead to a variety of different hues—none of them green. The book's famous catch phrase is "Blue is blue, and red is red! They still need green!" Children's book author and illustrator Paul O. Zelinsky, for whom the book was a childhood favorite and inspiration, said that,
Color spaces for specifying a color in terms of three particular primary colors. Each method has its advantages and disadvantages depending on the particular application. No mixture of colors, however, can produce a response truly identical to that of a spectral color, although one can get close, especially for the longer wavelengths, where the CIE 1931 color space chromaticity diagram has a nearly straight edge. For example, mixing green light (530 nm) and blue light (460 nm) produces cyan light that is slightly desaturated, because response of the red color receptor would be greater to the green and blue light in