This review is dedicated to the memory of Prof. Charles E. White, who was at first the sole author and then the senior author of the 13 previous biennial reviews in this series. He was a leader in establishing the value and importance of fluorescence analysis; he was also a good and warm-hearted person, whose death in May 1973 was a real loss.were found to be very sensitive fluorescence reagents for detection of Zn, Al, Sc, Ga, and In, as well as suitable for quantitation of, for example, Zn at pH 6.9-7.2 in 80% EtOH (845). Acridine fluorescence quenching by iodine was proposed for the indirect determination of Au, Cr, Se,