Using only primary colors . . .
Someone asked if anyone has ever seen a painting done with aliz crimson, cad yellow med, and prussian (or thalo) blue. Yes, yes, and yes.
Find a copy of a book by Jose Parramon, The Big Book Of Oil Color. In an effort to get his students/disciples to learn color, he asks you to do (as has he) several painting using only these three colors and white.
I've done a couple, myself.
You can make a creditable cad red (light or med or dark) with nothing more than cad yellow med, and aliz crimson. For the light red, you may have to add just a tot of white.
Put out a little of each color and play around. There isn't a color you can't make if you twiddle the knobs a bit.
As for using black for blue, remember that we tend to see a color's opposite when we look at a particular color. I didn't say that well, but, for example, of you've painted a red, or orang-ish passage, and put a gray (black and white) beside it, it will look blue. In fact, ivory black contains much blue. You can make some really green greens using black and yellow.
Just some thoughts.
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