With this reagent, 3,4-MDPV forms a light leafy skin on the surface of the drop. This leafy growth is best visualized under crossed polars. At high concentrations of 3,4-MDPV, under this surface leafy formation, insect like clusters are also observed. This reagent and the observed crystal formation is not characteristic of 3,4-MDPV and therefore is not suitable test.
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