VineyardFresh preserves open wine by simply spraying 2 quick bursts into an open bottle of wine then re-cork, VineyardFresh creates a protective barrier between remaining wine and the air left in the bottle, preventing oxidation, It"s naturally heavy enough to preserve your wine, light enough to be colorless, odorless and tasteless, VineyardFresh is 100% pure Food Grade Argon and works on a combination of Chemistry and Physics, Chemistry-Argon is an inert gas and does not interact with wine, Argon is non-metallic, colorless, odorless, tasteless and naturally in the air we breathe, Argon is heavier than oxygen and lighter than wine, Physics-The heavier gas will displace the lighter gas, Argon displaces the oxygen and creates a vapor barrier between the wine and the oxygen, preventing oxidation from spoiling the wine, SKU: WNAGLD017