It used to be so simple. Wine would complete its alcoholic fermentation and be transferred into barrels, more or less new according to the strength of the year. The source of the oak would most likely be the nearest forest; you might worry a little bit about how much the oak had been toasted.

Today the degree of toast is tightly controlled, sometimes using infrared rather than mere simple fire, and is reproducible. “We at Taransaud know what medium toast is, we measure it by time and temperature, but some people still use color, which is very variable,” says Jean-Pierre Giraud. Toast was the elephant in the room at the afternoon session of Taransaud’s seminar for the Institute of Masters of Wine: it was rarely mentioned directly, but I suspect that it was the main determinative factor in barrels that had been designed for very specific purposes.

I was fascinated by the concept that a barrel could be designed directly to handle higher alcohol wines. I’ve had the view for some time that the problem with high alcohol wines is not just the higher alcohol, but a generally higher level of extraction, which makes them fatiguing to drink (although sometimes apparently performing better at tastings). I hadn’t followed through to ask the corollary question: when and where does the higher extraction take place and could it be changed?

Alcohol is a solvent, and perhaps its most obvious effect is on maceration: different tannins are extracted by pre-fermentation maceration (when there is no alcohol) from post-fermentation maceration (when alcohol is present). But the question implicit in Taransaud’s design of a barrel for higher alcohol wines is whether there will be differences in extraction during élevage of a 15% alcohol wine from a 13% alcohol wine, and whether the barrel can be adjusted to equalize the effects.

The starting point is that alcohol affects the perception of other components in the wine, reports Dominique de Beauregard of Taransaud. It masks some components, especially fruit aromas, and exacerbates others, in particular herbaceous elements. Higher alcohol extracts more toast aromas, making the wine seem heavier and more tannic. (From this I would guess that some of the adjustment to higher alcohol involves reducing the toast.) So Taransaud have developed a barrel – the working name is the A+ – which is intended to enhance fruit to compensate for the effect of higher alcohol.

I thought the blind tasting of Izquierdo 2010 from Ribera del Duero, matured in either a regular barrel or an A+ barrel, was inconclusive. In the regular barrel, the wine was tinged with savage, even animal, notes, and the finish seemed harsh and bitter. These problems were ameliorated by an impression of more fruit and a softer palate with the A+ barrel, but the wine was still pretty biting with a burning finish. I am sorry, but once you have reached 15.5% alcohol, I’m not convinced that any change in the élevage is going to bring the wine back to a reasonable balance.

The next special effect was a barrel intended to “reveal Chardonnay’s typicity and quality.” I think an issue’s going begging here, however. What is the typicity of Chardonnay? I think of it as the chameleon grape, capable of flinty minerality in Chablis, nutty overtones in Meursault, steeliness in Puligny, butter and vanillin in Napa, tropical fruits in South America. If ever there was a grape that responds to the winemaker, this is it!

Be that as it may, it seems that Taransaud, firmly centered in France, sees minerality and tension as the objective for Chardonnay. (So do I.) They wouldn’t say what is special or different about the PFC barrel that is their prototype for Chardonnay, except that the wood was carefully selected for grain, seasoning, and toasting. (This is somewhat along the lines of a phrase often found in scientific papers to which I take strong exception. “We performed the experiment carefully.” Well, yes, how else would you perform it?) Anyway, I certainly see the merit of the notion that perhaps oak should be different for Chardonnay from Pinot Noir or from Cabernet Sauvignon. However, I wasn’t persuaded by the results of this particular experiment. A Domaine François Lumpp 2011 Givry in a traditional barrel had a nose and palate showing a nice combination of citrus fruits and oak overtones, smooth and well integrated. The PFC barrel seemed to give a more muted impression and I thought I got a fugitive touch of high toned aromatics on the nose, with the acidity standing out to make the palate seem a bit disjointed. This is clearly a work in progress.

Egg-shaped fermenters are all the rage at biodynamic producers, who feel that the shape encourages a natural fluid movement that reduces the need for intervention. This is something that could presumably be measured, although I haven’t yet seen any attempt at objective judgment. Egg-shaped fermenters come in cement and now Taransaud have introduced one in wood, called the Ovum. The blind tasting was a comparison of Domaine de Chevalier 2011, 100% Sauvignon Blanc, given six months in conventional 225 liter barrels, 400 liter barrels, or a 2000 liter Ovum.

Now the problem here from my point of view is that we are not comparing like with like. The main effect is surely going to be the different ratio of surface area to volume, which is greatest in the 225 liter barrel, about 20% less in the 400 liter barrel, and only about half in the 2000 liter container. (And a further complication is that in barrels the inside is usually toasted but the heads are not.) For this to be a significant test of shape, we would need to compare a barrel or a cylinder of 2000 liters with the Ovum.

Anyway, the blind tasting to my mind validated the idea that they have learned something in the past couple of hundred years about the best containers for maturing white wine. The traditional barrel gave a classic impression, with a typical citrus fruit spectrum tinged with oak, becoming soft and ripe in the glass. The 400 liter barrel gave a much less oaky impression, with the citrus fruits coming to the fore. The Ovum gave a grassier wine with more zest, fresher and purer, but less interesting. When the audience was asked to vote for their preference, the choice was interestingly for the 400 liter, but I think that did not make sufficient allowance for the fact that the wine is very young and normally would have many more months to mature before tasting. Allowing for that, my preference was for the traditional barrique.

The final tasting was a test of Taransaud’s T5 barrel. All we could learn about this was that the wood is seasoned for five years, it comes from French oak with a very tight grain, and there is a special toasting procedure on an open fire at low intensity. Oh, and a barrel costs about €1200 compared to the usual €700. It’s intended to bring refinement to the wine. The test tasting was of Château Beauregard (Pomerol) 2009 matured in either a standard barrel or a T5 barrel. There was definitely a difference. The classic barrel produced a wine that was rich and fruity with oak that was relatively subdued on the nose but more evident on the palate, in fact it was quite dominant. Slowly emerging fruit gave a youthful impression of needing quite a bit more time. The T5 sample was more subdued, almost closed on the nose, with the fruits initially seeming sweeter and riper, and better integrated, on the palate. It gave the impression that it will be ready to drink a year or two sooner than the wine from the classic barrique. All of the winemakers – some of whom are using T5 barrels – said they preferred it. But this tasting was not done blind. I hate to spoil the party, but I wonder whether this is like malolactic fermentation in barrel: the question is whether it is a short-term effect or will persist? Will the two wines be any different in five or ten years’ time?

I really admire the efforts to go behind simply turning out high quality barrels into examining all the factors that influence the effects of wood on the wine, and asking how and which changes should be made for different situations. Just as Riedel has created a perception that we should no longer use the same glasses to taste all wines, it makes me wonder whether in years to come, we will look back and wonder at the primitive nature of the idea that oak barrels might be generic for all wines.