Wine can be made with red grapes or white grapes, and, especially in the case of red wines, a number of doctors have reported that a moderate amount of wine has certain health benefits. This may be one of the reasons why the number of people drinking wine has risen over the past years. As new wine-shoppers browse the shelves of their local markets, they face a tough decision. Should they buy a wine with a cork or a screw top? And shoppers are not alone in their dilemma. Wineries are also facing tough choices in the best way to seal their products. The root of the problem lies in " cork taint". Cork taint refers to a problem with wine that has been sealed with a bad cork. Traditionally, all corks are made from a special oak tree that grows around the Mediterranean. In the process of making the corks and sealing wine bottles, a certain type of mold may start to grow on some corks. Over time, this mold can produce a chemical that makes the wine inside the bottle taste musty. In fact, the human tongue is so sensitive to this particular compound that people can taste it even diluted up to six parts per trillion!