Gunshot residue on hands can he detected by which test-

Ans. is 'c' i.e., Dermal nitrate test o Dermal nitrate/ paraffin/diphenylamine test:It is used to detect firearm residues on the hands of the suspectIn this, the hands are coated with a layer of liquid paraffin. After cooling, the casts are removed & treated with an acid solution of diphenvlamine, a reagent used to detect nitrates & nitrites that originate from gunpowder & is deposited on the skin of the person who has fired the shot.A positive test is indicated by the presence of blue flakes in the paraffin.o Benzidine test- most sensitive test for detection of blood,o Phenolphthalein / Kastle Mayer test-screening test for blood stainso Harrison & Gilroy test hydrogen activation analysis- is used to detect heavy metal. These heavy metals are detected from entrance wound where they are components of the residue discharged from the cartridge of a firearm weapon.