An Explanation of the Liesegang Phenomenon

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Science  15 May 1959:
Vol. 129, Issue 3359, pp. 1365-1366
DOI: 10.1126/science.129.3359.1365


Periodic band precipitation in porous media is explained by means of the Hirsch effect (specific semipermeability of the precipitate occurring only as long as both the precipitate-forming ions are present). The possibility of getting Liesegang bands in immunological precipitates is underlined, and a suggestion is made how to avoid them.