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Table 1

Color, appearance, film thickness and optical properties of samples prepared at different temperatures with 0.0015 and 0.0035 mol/l concentrations of Fe and Mn, respectively.

Sample Preparation temperature (°C) Color and homogeneity Film thickness, in microns Solar absorptance and emittance
(a) 350 Reddish, uniform 1.011 0.75; 0.03
(b) 400 Reddish, uniform 0.749 0.76; 0.04
(c) 450 Reddish, uniform 1.170 0.89; 0.05
(d) 500 Dark reddish, uniform 1.008 0.78; 05
(e) 600 Black, uniform 0.450 0.94; 0.07

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