Mixing and Unmixing (4F10.10)
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The volume between two coaxial cylinders is filled with glycerin and a thin column of red dye. When the inner cylinder is rotated, the dye appears to be mixed but is distributed in a fine cylindrical shell within the glycerin. Reversing the direction of inner cylinder rotation will cause the original dye column to reappear.
Note: Please talk to us about this first.
1) Heller, John P. "An Unmixing Demonstration." American Journal of Physics 28, 348-353 (1960).
2) Taylor-Couette Flow [Wikipedia].