Last time we asked "Why do people look so closely at their glass of wine?" and learned that flaws, such as sediment and dis-colorization can be seen in a wine glass.
But, the color of a wine can also tell you about how it will taste and its age.
With white wines, pale yellow-green color generally indicates a light bodied wine that will have bright, crisp fruit flavors and higher acidity (e.g., Pinot Grigio and Sauvignon Blanc). A deep golden colored wine will tend to be full bodied, bolder in flavor and lower in acidity (e.g., Chardonnay).
With red wine, you'll find that those that tend toward pink to light red will be light bodied and bright in flavor (e.g., Beaujolais and Pinot Noir). They may even be a little tart. As the color of a red wine gets darker towards maroon and purple, it will become more full-bodied with bolder and richer flavors (e.g., Zinfandel, Merlot, Syrah and Cabernet Sauvignon).
Color can also tell you something about a wine's age. You know that fruit eventually turns brown with age. This is also true of wines. Older white wines become dull in color and can take on orange and brown tones. This is usually an indication of a wine that is well beyond its peak and will likely have nutty flavors due to oxidation. With red wines, they too take on brownish tones, especially around the rim of the glass. But, with red wines, this doesn't necessarily indicate that they are beyond their peak. Most older red wines (10 years +) will look this way.
So, next time you are poured a glass of wine, stop and take a moment to look at it and see if you can figure out how it will taste even before your first sip. Cheers!