A straight-up answer to a screw-cap query

Q: Should a mid-quality wine with a screw-top be stored on its side?

A: The use of screw-caps (the most common is the Stelvin closure) as an alternative to traditional cork has become more and more an accepted practice throughout the wine industry.

There are many other synthetic (noncork) closures on the market, and the competition has become fierce. Scientific studies on the aging potential of most of these products do not always agree. It seems that someone somewhere who makes a competing product stands ready to dispute whatever studies have been done.

But time is the best test, and the Stelvin seems to be doing pretty well. It has moved from being used almost exclusively for inexpensive, drink-now white wines, to being the closure of choice for both whites and reds, including some reds designed for long-term storage.

The criticism had been leveled that the screw-cap seal is too efficient, and the wines won't age; additionally, some wineries have experienced a problem with wines being reductive (due to lack of oxygen) which can lead to off flavors and aromas.

Alcan, the company that makes the Stelvin closure, offers different options for different types of wine. Its Web site confirms that bottles may be safely stored and transported in all positions — upright, on their side or even with the neck facing downwards.

Paul Gregutt answers questions weekly in the Wine section.

He can be reached by e-mail

at wine@seattletimes.com.