Indicator for the EDTA titration of copper. R. Belcher, R.A. Close and T.S. West, Chem. and Ind., 1957, 1647; Spectrophotometric reagent for beryllium A.M. Cabrera and T.S. West, Anal.Chem, 35, 311(1963). Application: For Professional, Scientific and Technical Activities, Scientific Research and Development