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Fig. 1. —Absorption spectra of methyl thymol blue and methyl thymol blue—gadolinium complex. Graph shows that absorption spectra of unbound methyl thymol blue (solid line) and methyl thymol blue—gadolinium (dashed line) differ. Free methyl thymol blue has maximum absorbency at 425 nm, coloring the solution yellow, whereas maximum absorbency for methyl thymol blue—gadolinium complex occurs at 605 nm, coloring the solution blue.