Study Challenges Long-Held Beliefs About Red Wine Color and Quality

A recent study suggests that a long-standing assumption in the wine industry—that darker red wines are inherently superior—may not hold true. The research, which involved 82 regular red wine drinkers, found that while color does influence initial expectations, it is a poor predictor of actual enjoyment once the wine is tasted.

Participants were asked to rate the appearance of eight red wines, including five hybrid varieties and three pinot noirs. They also judged how much they expected to enjoy each wine before sipping. The study observed that lighter wines or those with yellow or brown tones were generally viewed less favorably, with deep red-purple colors generating higher expectations. However, upon tasting, these initial color-based judgments proved largely insignificant.

"The fact is, taste and aroma are so much more important than colour in overall quality perception," stated co-author Catherine Dadmun from Cornell University. Appearance accounted for only about eight percent of the variation in drinkers' ratings, underscoring the greater importance of taste and aroma.

This finding could be particularly beneficial for winemakers utilizing hybrid grape varieties. These grapes are developed by crossing different species to enhance resistance to diseases and cold weather, making them more sustainable and adaptable to climate change pressures. Varieties like Marquette, Maréchal Foch, and St Croix can be cultivated with reduced pesticide use and can survive harsh winters that would damage conventional grapevines.

Historically, winemakers have expressed concern that hybrid grapes might produce wines with lower color intensity or hues that deviate from the deep red-purple typically associated with traditional Vitis vinifera grapes. "This has been bugging me for a long time," said author Anna Katharine Mansfield. "Prior to coming to Cornell I worked with breeders at the University of Minnesota and often there was this idea that consumers would reject a wine if its color didn't look very Vitis vinifera-like. But no one had ever studied that question."

The study, published in the American Journal of Enology and Viticulture, evaluated commercial wines from various regions. The analysis revealed that the least visually-scored wines were not necessarily the lightest, but those with a tendency towards brownish or yellow-tinged hues. Dr. Mansfield noted that color evaluation often occurs in the glass, and that the protective green glass used for bottles can make color less of a factor in purchasing decisions.

"My hope is that people breeding hybrids can just worry less," Dr. Mansfield concluded. "We want them to focus instead on the parameters of what makes a good wine."