For centuries, wine bottles have been topped by cork harvested from trees, especially from Portugal. The cork is naturally spongy to permit squeezing into a bottle, and expands to form a tight but breathable seal. Scientists discovered that cork can sometimes ruin wine, and a search for alternatives was on. In the U.S., innovators have developed plastic corks that are cheaper and just as effective as natural cork, leading natural cork producers to search for a strategy to differentiate their product.Seeking Closure: Plastic Stoppers Crack 400-Year-Old Natural Cork Monopoly - WSJ.com
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