The transparency level of pure chitosan film (CG0) and all chitosan-based composite films (CG1, CG2 and CG3) were measured quantitatively, as shown in Table 1. As can be observed, the incorporation of GFSE did not affect the transparency of the films. There were no significant differences in the light transmission values with increment of GFSE amounts added in the chitosan-based composite films, and all chitosan-based
composite films showed remarkable transparency at visible range. Therefore, it could be concluded that the transmittance of all chitosan-based films was not affected by the incorporation of GFSE.