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Tears of wine are colorless liquid droplets, which is continuously formed in the inner wall of glass, caused by Marangoni effect. The effect is a phenomenon in which the boundary of the thin film moves against the gravity in order of different surface tensions depending on the different locations. Alcohol evaporates faster than water, but the surface tension of water is greater than alcohol. This heterogeneity causes the force to pull the thin film along the walls of the glass. The intensity of this phenomenon depends only on the ethanol content.
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