Hello there! I'm Dr. Vinifera, or "Vinny" for short. Ask me your toughest wine questions, from the technical aspects of winemaking to the fine points of etiquette. I hope you find my answers educational and even amusing. Looking for a particular answer? Check my archive and my FAQs. You can also follow me on Twitter: @AskDrVinny.
Dear Dr. Vinny,
When you look at a grape, there is sometimes a powdery film covering the skin. Is this dust, or a product of the grape? And does it have any effect on the juice and the wine produced from it?
—Greg C., Danville, Calif.
That bluish or grayish white stuff is called "bloom." You'll find it on grapes, blueberries, plums and other soft fruits. It's a waxy covering that protects fruit from environmental damage like water loss and spore penetration. It is flavorless and doesn't have any effect on juice or wine.
Do you have a question for Dr. Vinny? Ask it here...
Learn to taste wine like a pro, pull a cork with flair, get great wine service in a restaurant and more
Learn from the experts and get the most out of each sip. Take one of our online courses or take them all—from the ABCs of Tasting to in-depth seminars on Food Pairing, California Cabernet, Bordeaux, Tuscany, Sensory Evaluation and more.
Passionate about wine? WineSpectator.com seeks a highly motivated digital journalist for an assistant editor position in its New York editorial department.
Sips & Tips | Wine & Healthy Living
Video Theater | Collecting & Auctions
New! Ratings Flash