Color Back Catalog number: 50820 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 59427 Total Residual Free Chlorine (Cl) Price on request 70294 Trichlorofluoromethane, 1000µg/ml in MeOH, 1ml Price on request 673234 Clofentezine, 10.0 µg/ml, Acetonitrile, 10ml Price on request