Scattered colorimetry and multivariate data processing as an objective tool for liquid mapping

Scattered colorimetry, i.e., multi-angle and multi-wavelength absorption spectroscopy performed in the visible spectral range, was used to map three kinds of liquids: extra virgin olive oils, frying oils, and detergents in water. By multivariate processing of the spectral data, the liquids could be classified according to their intrinsic characteristics: geographic area of extra virgin olive oils, degradation of frying oils, and surfactant types and mixtures in water.