TY - JOUR T1 - Study of Color of Quaternary Mixtures of Wines by Means of the Scheffé Design JF - American Journal of Enology and Viticulture JO - Am J Enol Vitic. SP - 232 LP - 240 DO - 10.5344/ajev.1990.41.3.232 VL - 41 IS - 3 AU - A. I. Negueruela AU - J. F. Echavarri AU - M. L. Los Arcos AU - M. P. Lopez de Castro Y1 - 1990/01/01 UR - http://www.ajevonline.org/content/41/3/232.abstract N2 - Standardization of the color of each non-vintage is an important duty, but color specification is difficult. In this article we investigate empirical models using Scheffé polynomials to describe color response surface for four Rioja wine mixtures. The accuracy of color response prediction is shown as color differences in CIELAB units. The color response surfaces are visualized by preparing contour plots that depict color variation over a compositional region. ER -