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In this study a simplified Kubelka-Munk model is proposed for colour matching purposes. Opaque glazes were prepared to determine the absorption optical constants from the reflectance curves measured with a spectrophotometer. After the physical and chemical characterization of the glaze components (frit and pigments), to analyze the spectrophotometric results a simplification of the Kubelka-Munk model was suggested.To experimentally verify the model, two target green colour were reproduced in laboratory by adding in an opaque glaze a yellow praseodymiumdoped zircon ((Zr,Pr)SiO 4 ) and blue vanadium-doped zircon ((Zr,V)SiO 4 ) pigments. The results were in good agreement with the experimental reflectance curves and the prediction of colour green glazes was possible with a reduced number of experiments.