Ammonium By Chloroplatinic Acid

These are crystals of ammonium chloroplatinate (NH₄)₂PtCl₆ formed in a hanging drop of chloroplatinic acid over a test material containing the ammonium ion or for which a predicted reaction would release ammonium hydroxide. In this case the reaction is urease with urea. This is a good test to detect the presence of urine.