Gun Shot Residue Single Element Kit Back Catalog number: 52257 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 11697.12-100-IO 2,3,4,6-Tetrachlorobiphenyl ,100 µg/mL,isooctane,1mL, Price on request 79482 Methyl hexadecanoate Price on request 11672.12-100-IO 2,2',6-Trichlorobiphenyl ,100 µg/mL,isooctane,1mL, Price on request