by J. Michael Wheeler
If a bottle of wine sealed with a cork spoils, you say the wine’s corked. If a bottle of wine sealed with a screw cap spoils, would you say the wine’s screwed?
Natural cork, the bark from the Portuguese cork tree has been keeping the air from bottled wine for over 300 years. But cork’s been in trouble for the past couple of decades. Cork taint, the musty “this wine’s gone bad” taste, is caused by the chemical compound TCA (trichloroanisole). TCA is introduced to a cork by a natural mold. It can occur at the harvesting, manufacturing, or storage stages. Imperfect corks can also allow too much oxygen into the bottle, termed random oxidation, and cause the wine to spoil.
Winemakers have recently been exploring alternative closures; the most popular of those have been plastic stoppers (12% of current world market) and the screw cap (7% of current world market). But many new closures are becoming available.