Enzie,
I'm starting a new portrait, so I took a little section in the upper right hand corner to repeat the "white ball" painting directly on white canvas, and it worked fine.
I used W/N ivory black for the blue, yellow ochre for the yellow, alizarin crimson for the red, and W/N burnt umber for the black bottom. The ivory black definitely looks blue, and the umber looks black.
Peggy
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