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The surface area of wine in contact with air inside a glass. The color of a wine is its general apperance, while the rim shows its reflections. During a tasting, the glass is tilted to enlarge the rim in comparison to the core, and the wine’s color palette can be seen in natural light on a white background. The thicker the wine, the more acidic the wine, and the more its brightness is revealed, its ability to reflect the light.