Wine News: Controversy mounts over best way to seal wine bottles

"LET'S GET SOME closure. One of the most controversial topics in the wine industry is the use of natural cork to seal a bottle. There are many alternatives being researched, with varying levels of success.

Cork is harvested from the bark of a variety of oak tree, Quercus Suber L. The bark is usually harvested every nine years. More than 50 percent of the world's cork production comes from Portugal, where the soil and the climate enable the trees to live longer.

As a natural product, it is environmentally sound. The problem with cork is that it is subject to mold. This is caused by a chemical called TCA (2,4,6-trichloroanisole for you technical people out there)."

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