As discussed above, an overlay of the signal from β-carotene, gelatin and the ascorbylpalmitat is observed in the UV region. In this range, a shift of the peak maximum to higher wavelength with increasing sedimentation coefficient is detected. In addition, a drastic decrease of the peak height relative to the 450 nm peak is observed with increasing sedimentation coefficient. The particles that sediment slower show stronger UV absorption, which we attribute to a higher content of ascorbylpalmitat, and hence smaller particle diameters due to the formation process in co-precipitation Auweter et al. 1999). To our knowledge, it is the first time that relatively small steps of spectral shift among an H-aggregate are shown for composite particles. All of the 200 different detected spectra follow the same trend. Although the spectral changes appear to be continuous, that does not exclude defined and different spectra for different particle populations as the detected raw signals are those of a sample band, which is broadened by polydispersity in size, composition and diffusional broadening.