5% Aqueous HAuCl4
Tests for NRG-3 are not very sensitive. With 10-20 μg of the substance dissolved in water, 10% hydrochloric acid or 10% acetic acid, NRG-3 forms large composites of yellow plates and blades. However, the time taken for crystal formation is very slow with crystals fully forming after 1 hr.
The IR spectrum of the crystal is representative of the crystal structure.