I'm not sure why one would like to reduce their palette to three colors and in any case it does not work. Did you try before you asked this question? The physical characteristics of oil paint are quite different than process colors and unless you can anticipate exactly where your whites or near whites will reside and have the patience to paint around these areas you will go mad. I would like to see a decent painting made without white. Although I like to keep my palette limited I also keep a lot of special colors on hand if a specific project calls for them. It's also hard to argue with the broad palette of Nelson Shanks with some exotic (and expensive) colors. If you have ever been fortunate enough to see his work first hand you would understand why CMYK doesn't do his work justice.
I worked for American Greetings years ago (great job) and can tell you that many prints were done with CMYK plus special colors to get better reds for Valentines and Xmas subjects. You should also note that many upper end digital printers will print up to 6 colors. If it were at all practical I would love to have an everlasting supply of the greatist range of colors possible.
Artists like Daniel Green premix a big range of colors normally found on the face and this cuts down on the amount of time you might spend searching and trying to remember what combination of colors you previously employed to arrive at certain shades and reduces the amount of mud created on the way to color we need to do the job.
I am also confused about the use of black to replace blue? I'm doing a painting of a young girl with a patterned dress with red, yellow and blue flowers. How in the world can I do that with black? Not to mention the summer sky above.
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