TY - JOUR T1 - Influence of Light on Color Development in <em>Vitis Vinifera</em> Grapes JF - American Journal of Enology and Viticulture JO - Am J Enol Vitic. SP - 179 LP - 184 DO - 10.5344/ajev.1960.11.4.179 VL - 11 IS - 4 AU - Robert J. Weaver AU - Stanley B. Mccune Y1 - 1960/01/01 UR - http://www.ajevonline.org/content/11/4/179.abstract N2 - Tokay clusters were enclosed in black or brown waxed bags after berry set. No coloration developed in the absence of light, and only a small amount of color in the light that penetrated the brown bags. Bagged Thompson Seedless clusters warmed up more slowly during the first part of the day, and cooled off more slowly. Bagging had little or no effect on maturation. Tokay berries colored normally, even if subjected to darkness from the period of berry shatter to the time coloration begins. When light was excluded from portions of clusters by bagging or from portions of berries by wrapping in aluminum foil, only the exposed portions colored. Forty varieties of Vitis vinifera were bagged during the season of growth. All clusters colored about like the unbagged controls except Tokay and Sultanina Rose, which remained green in the dark, and Emperor, which developed only a slight pinkish tinge in the dark. ER -