Developed in France by top sommelier Franck Thomas and enologist Laurent Zanon, the Clef du Vin or "wine key" simulates the effects of time on wine. A proprietary alloy acts as a catalyst to speed up the oxidization process. The metals are precisely gauged so that dipping the Clef du Vin in a glass of wine for one second will mimic the effect of a year's aging. Dipping it for two seconds simulates the effect of two year's cellaring, and so on. The Clef du Vin will help determine which vintages are worth waiting for, and for how long. The metals do not leach into the wine, so it is not harmful to drinkers. The Clef du Vin is a measuring instrument that reveals your wines' ageing potential in the blink of an eye. It works effectively on all types of wines: whites, sparkling, rosés, reds and naturally sweet wines.