Platinic bromide reagent results in two distinct forms of crystals when mixed with platinic bromide reagent. The round, tight clusters of light, orange hairs are prominent. The centers of the clusters are very dark and the loose ends are bright under crossed polars. The composites of irregular thick yellow-orange tablets grow very large. These composites are very bright under crossed polars and different parts of the crystal go dark at different times. The crystals are very thick and do not give good IR spectra.