La couleur des vins rouges. 2e partie : mesure, origine et interprétation

<p style="text-align: justify;">The various analysis required for the measure of the red wines color are discussed and explained : absorbance at 420, 520 and 620 nm, determination of anthocyanins, p.v.p. and ionisation index.</p><p style="text-align: justify;">The part played in the absorbance at 520 nm by the free anthocyanins and the tannins-anthocyanins complex is investigated.</p><p style="text-align: justify;">The study of two red wines from two vinifications and stored in barrels for six months is carried out as an application.</p>