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Enzie,
If the color is the same, (both ivory black and Prussian blue are both "blues"), and the values are the same, then the warmer color will proceed and the cooler color will recede. Ivory black in a cool blue, so it will recede, pushing the background back. If you use the Prussian blue, the intense chroma and warmth will make the background pull forward, the problem you are trying to fix.
If you are trying to demonstrate atmosphere behind the main figure of the model, you want the chroma of the background colors to be toned down. I don't use Prussian or phthalo blue on my palette, and did not recommend that you "wash back" your onions with those colors. I suggested that I usually recommend using burnt umber and ivory black or dioxazine purple to "wash back" a background. The burnt umber is a nice neutral, and the ivory black or purple will cool it down if it is too warm.
On to the question about ivory black as a blue, Karin has many more examples than I because she uses a limited palette, but I do have one of those famous "white ball" paintings I did in one of her workshops. The "blue" background behind the ball is created with ONLY ivory black and white. The "black" bottom portion of the painting was done with ONLY burnt umber. (Look how nicely the ivory black behaves itself and stays in the background.)
Peggy
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