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Dear Dr. Vinny,
I often see racking in cellars that store bottles on a 45-degree angle so that the bottle is displayed. Is this a safe practice, or does it cause the cork to lose contact with the wine and thereby dry out over time?
I'm sitting here with some bottles of wine and a protractor, and it appears that with most bottles and fills, wine comes in contact with the cork at a minimum of a 45-degree angle. It's better than standing the bottles completely upright (though not as good as lying them completely on their side), and as you say, it's a good position to showcase (and read) labels.
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