Figure 3. Reflectance spectra for; (i) TiO2- coated textured aluminum surface (top), and (ii) dip coated TiO2- bound, CuFeMnO4 paint on textured aluminum surface (bottom)

From

Optical Characterization of TiO2-bound (CuFeMnO4) Absorber Paint for Solar Thermal Applications

C. O. Ayieko, R. J. Musembi, A. A. Ogacho, B. O. Aduda, B. M. Muthoka, P. K. Jain

American Journal of Energy Research. 2016, 4(1), 11-15 doi:10.12691/ajer-4-1-2