PT - JOURNAL ARTICLE AU - A. I. Negueruela AU - J. F. Echavarri AU - M. L. Los Arcos AU - M. P. Lopez de Castro TI - Study of Color of Quaternary Mixtures of Wines by Means of the Scheffé Design AID - 10.5344/ajev.1990.41.3.232 DP - 1990 Jan 01 TA - American Journal of Enology and Viticulture PG - 232--240 VI - 41 IP - 3 4099 - http://www.ajevonline.org/content/41/3/232.short 4100 - http://www.ajevonline.org/content/41/3/232.full SO - Am J Enol Vitic.1990 Jan 01; 41 AB - 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.