Under acidic conditions of 10% HCl, 2-EMC with aqueous platinic chloride forms thick, long, colorless prisms that grow end to end. The crystals display bright interference colors in crossed polars with different parts of the composite growing dark at different angles.
The crystals are very thick and are not ideal for transmission spectra but sufficient peak information can be obtained. Spectral quality is dependent on the crystal chosen for analysis.
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