Anthocyanins and tannins (skin and seed) for Merlot and Syrah berries grafted to various rootstocks over three vintages (2007–2009) and two scions. Anthocyanins and tannins (skin and seed) for Merlot and Syrah berries grafted to various rootstocks over three vintages (2007–2009) and two scions. Means are presented with standard error. Tannins are presented in catechin equivalents (CE). Results are provided on fresh weight (FW) basis. James F. Harbertson, and Markus Keller Am. J. Enol. Vitic. 2012;63:40-48 © 2012 by the American Society for Enology and Viticulture