In light of some of the comments on value, limited palette and color/mixing charts I thought I'd share this assignment I have my students do.
The top scale is white to black in even steps (shooting for 10% each step).
The bottom scale is just primaries plus white, trying to match the gray scale.
For more thorough information on making up color charts as duztman suggests, you can check out Richard Scmid's book "Alla Prima" or Steve Allrich "Oil Painting for the Serious Beginner". Both cover it really well.
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