Contro et al. investigated the quality deterioration of soya oil in 1-L plastic bottles made of HDPE, coextruded with a layer containing black pigment, during storage at 23 C. Soya oil stored in a metal container was used as a control. No differences were found between the organoleptic properties of the oil contained in the metal and plastic containers throughout the total storage time investigated (113 day). Over the same period, the chemical quality of the oil remained within the limit of stability.