Selected compositions were investigated in terms of the absorption of certain wavelengths of visible light using a Jasco V-530 UV/Vis spectrometer (Jasco International, Tokyo, Japan) and Jasco Spectra Manager software (V. 1.53.00, Jasco, Easton, MD, USA). The film samples were vertically mounted to the distal wall of the cell holder. Air was a reference. The transparency of the film samples was assessed, calculated as a function of transmittance measured at 600 nm, using the following equation
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