Description: Several drops of a brown solution are placed in a well cut into an agar gel. Two electrodes are connected to the terminals of a 9V battery and inserted on either side of the petri dish. Within a few minutes, the solution has migrated, and there is a blue and yellow band in the gel.

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Source: Shakhashiri, B.Z. Chemical Demonstrations: A Handbook for Teachers of Chemistry

Year or vol: 4 page: 150

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