"In theory, any colour can be obtained by the mixing of the three basic primaries. In practice the nature of pigments means that it is not so simple and so many more colors are used than just the primaries. It doesn???t mean the primaries aren???t useful and if a wide range palette with as many colors that can be obtained from just a few as possible colours is desired, a good starting point would be Matisse Primary Yellow, Red, and Blue, plus black and white. These primary colors are extraordinarily valuable for educators teaching the basics of color mixing theory and there are those artists who do try to use a very simplified palette who like to work with pure primaries. Those artists who wish to experiment with the visual mixing of colors in a Pointillist technique find that working with pure primaries usually gives the best effect.
As no single permanent artist pigments exactly match the spectrum primary, Matisse has blended yellows and a white to get the correct shade. This is a bright and clean pure yellow that has the advantages of versatility when mixing a wide range of colors, great beauty as a yellow, and affordable cost.