The UNEQ, PLS and MLF neural network methods in the modelling and prediction of the colour of young red wines from the Denomination of Origin ‘Rioja’

The modelling of the colour of young red wine of Denomination of Origin Rioja has become an issue of great practical importance. A UNEQ multivariate classification model for two categories (accepted wines and rejected wines), a partial least squares (PLS) model for the prediction of the value of the colour grading assigned by wine tasters and a multilayer feed forward (MLF) neural network capable of correctly classifying the wines in the two categories indicated were built based on oenologic parameters and psychophysical determination of colour.