5-IAI and gold based reagents all give similar crystals that differ in thickness and color. With aqueous gold chloride reagent form long, thick yellow blades with angled edges. 5μg of the substance dissolved in water when mixed with gold chloride gives the most reliable formation. The blades are very bright under crossed polars and can appear yellow to blue depending on the orientation. Also formed along the edges of the drop is a thick leafy crust that appears a light purple under crossed polars.