However, the effectiveness of decanting is a topic of debate, with some wine experts such as oenologist Émile Peynaud claiming that the prolonged exposure to oxygen actually diffuses and dissipates more aroma compounds than it stimulates, in contrast to the effects of the smaller scale exposure and immediate release that swirling the wine in a drinker's glass has.  In addition it has been reported that the process of decanting over a period of a few hours does not have the effect of softening tannins. The softening of tannins occurs during the winemaking and oak aging when tannins go through a process of polymerization that can last days or weeks; decanting merely alters the perception of sulfites and other chemical compounds in the wine through oxidation, which can give some drinkers the sense of softer tannins in the wine.  In line with the view that decanting can dissipate aromas, wine expert Kerin O'Keefe prefers to let the wine evolve slowly and naturally in the bottle, by uncorking it a few hours ahead, a practice suggested by wine producers such as Bartolo Mascarello and Franco Biondi Santi . 
About Jim Beam Decanters Everybody loves a classic car, and so when visitors and colleagues pass through your office or home, they are delighted with surprise as you reveal that the detailed ceramic figurine of a red 1963 Corvette Stingray on your shelf is in fact a functional Jim Beam decanter. Camouflage has never been the primary goal of these beguiling collector's items, though, as the earliest Jim Beam decanters were intended both for practical use and as table decorations. Over a century of special edition bottles have accumulated into an extensive market of stately designs and tchotchkes that is now well represented by the vast inventory on eBay. The angler in your life would surely appreciate the beauty of a Jim Beam fish decanter. Holiday shopping for your "Phi Sig" frat boy uncle, dad, or brother is easy with a Phi Sigma Kappa Jim Beam decanter. Anyone that gets a kick out of antique technology can enjoy one of the Jim Beam telephone decanters in the life-size, authentic-looking form of a vintage telephone. The pool of subjects and themes of these vessels is almost limitless. Poodles, lighthouses, cowboys, train cars; a Jim Beam decanter is a creatively charming American collectible.