How Beer Gets Its Color

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Pop open a belated birthday beer. Pour that beer into a clear glass, hold it up to the light, and take a good look at the color. Two basic chemical reactions are responsible for beer being 'beer-colored' rather than clear like water.
One reaction couples amino acids to sugars; the other spurs sugars to decompose. In addition to adding color to beer, the products of these reactions also add significant flavor to the resultant brew.