ninhydrin is a commonly used reagent that reacts to
334 Ninhydrin Reaction periments were performed by heating 1 cc. of standard ammonium chloride solution with 1 cc. of 10 per cent aqueous pyridine and 1 cc. of 2 per cent ninhydrin solution, with 1 cc. of dialuric acid solution of various strengths for varying periods of time in a rapidly boiling water bath.