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Not sure I understand your substrate example. let's say that "----" is the top barrier, "b' is a black particle, and "wwww" is the white substrate. Then in order to show black we have:
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bbbbbbbbbbbbbbbbbbbbbbbbb
wwwwwwwwwwwwwwwwww
Then in order to turn off the black we let the black fall down and we have:
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bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
wwwwwwwwwwwwwwwwwwwwwww
which still looks black. The second case would only look white if the black particles could fall down below the white particles. For example, if there are holes in the wwwwww layer big enough for the b's to fall through. In this case we wouldn't have a solid white.
So is this what you meant? Or is it something else? If this is the approach, it doesn't appear that a white substrate would work that well. By making both the white and black out of individual particles they can flow past each other, and yet form a 'solid' surface when their respective shade is at the top.
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