To support this recommendation we analyzed UVVA data from a recently published catalogue of optical spectra of oils [24]. The spectra in this catalogue were obtained with the Kontron UVIKON 810 Spectrophotometer using quartz cuvettes with a 1 cm optical path length. To cover the entire wavelength range (250-700 nm), oil samples were highly diluted with cyclohexane down to concentrations that yielded data within the dynamical range of the instrument.