Simply spray 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. A blend of nitrogen, carbon dioxide, and argon- just aspray keeps your open wine fresh for weeks. Treats at least 50 bottles. 0.25 oz