Gold bromide with 4-MeOPP gives three forms of concentration dependent crystals. The immediate formation is of light orange crosses that form abundantly. As with all gold based reagents, the drop immediately becomes orange with the formation of the crosses when the substance is mixed in. The flat, distinct, orange rectangular plates are formed next alongside the crosses. Large irregular red, tablets grow fewer in number and grow slower. All three forms are bright under crossed polars.
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