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A proposal for a method to measure the colour of red wines by measuring transmittance at three wavelengths / Propuesta de un método de medida del color de vinos tintos mediante la lectura de las transmitancia a tres longitudes de onda

Laboratorio de Color de La Rioja, Luis de Ulloa 20, 26004 Logroño

J.F. Echávarri

Laboratorio de Color de La Rioja, Luis de Ulloa 20, 26004 Logroño

A.I. Negueruela

Departamento de Física Aplicada, Facultad de Veterinaria, Universidad de Zaragoza, Miguel Servet 177, 50013 Zaragoza, Spain

Characteristic vectors analysis has been used to reconstitute the transmittance spectrum of red wines measured in 0.2 cm path-length cells. We have verified that an accurate reconstitution of the spectrum is obtained with the mean vector and the first three characteristic vectors. Applying the outputs obtained to the colour calculation, tristimulus values are obtained as a function of transmittance measured at 420, 520 and 620 nm. The errors involved, measured in colour differ ences, are less than 3 CIELAB units in 97% of the cases.

Key Words: colour • red wine

Food Science and Technology International, Vol. 3, No. 3, 189-193 (1997)
DOI: 10.1177/108201329700300306


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