Figure 1: Absorption spectra of FEX - dye complexes extracted into 10 mL chloroform: (3) 0.25 mL of 10-3 M FEX + 4 mL of 10-3 M BPB + 4 mL of pH 3.0 buffer, (4) 0.52 mL of 10-3 M FEX + 4 mL of 10-3 M BCP + 3 mL of pH 3.0 buffer, against their respective blanks (1,2) vs. distilled water.