The following low density polyethylene (LDPE) films were used in the experiments: (A) multilayer film pigmented with a black color on the inside and a white color on the outside (SCLAIRFILM-80E0337W7, DupontTM); (B) multilayer film pigmented with a white color on both sides (SCLAIRFILM- 90B0324PW, DupontTM); (C) multilayer film pigmented with a black color on the inside and a white color on the outside (SCLAIRFILM-90E0323W7, DupontTM), produced by DupontTM Pouch and (D) monolayer film pigmented with white TiO2, which is commonly used to package pasteurized milk in Brazil.