<prompt> Gunshot residue on hands can be detected by -Phenolphthalein testDermal nitrate testBenzidine testHydrogen activation analysis  <response>: The synopsis of forensic medicine toxicology ;Dr k.s narayan reddy ; 28th edition ; pg.no . 136 Paraffin test or dermal nitrate test is done to detect nitrates and nitrites .Melted paraffin is brushed on hand ,the wax is removed the inner surface of wax cast treated with diphenylamine or diphenylbenzedine reagent ,a blue colour developes where residue is present ,but it is obsolete . 