Fig. 4.

The solid trace in Fig. 4a shows the measured absorbance in holder 1 from a cuvette containing a mixture of microspheres and fluorescein in an acetate buffer. The dotted trace in Fig. 4a shows the measured absorbance when the cuvette is transferred to holder 2. The solid trace in Fig. 4b shows the derived molecular absorption coefficient using Eq. (8) and Eq. (9) and the data in Fig. 4a. The dotted trace in Fig. 4b shows the measured molecular absorption coefficient of an equivalent solution of fluorescein without the microspheres. The solid trace in Fig. 4c shows the apparent scattering absorption coefficient obtained using Eq. (8), Eq. (9) and the data in Fig. 4a. The dotted trace in Fig. 4c shows the measured apparent scattering absorption coefficient of an equivalent suspension of microspheres without fluorescein.