In the acidic gold chloride reagent, 3,4-MDPV forms colorless, light and leafy skin on the surface of the drop after the initial intense oiling observed. This leafy growth and its features are best visualized under crossed polars. On slow dissipation of the oiling, small insect-like clusters of plates are observed alongside the skin. These crystals are best formed at high concentrations of 3,4-MDPV.
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