Wine faults in Denmark
I'm currently enduring that special part of hell also known as Gatwick South Terminal, en route to Billund in Denmark, where tomorrow I'll be presenting a paper on wine faults at the XXth Entretiens Scientifiques Lallemand. I've never been to Denmark before, and seeing as I'm coming back tomorrow evening, I doubt I'll see much of it. Apparently, Legoland is in Billund.
Most of my talk will be based on the last three years' data from the International Wine Challenge. These data have been collected by Sam Harrop MW (pictured), who is a co-author on this paper, and they're really exciting. The strength of this data set is that it's large (c. 15 000 wines opened, 10 000 separate wines entered); it's a 'real world' analysis of faults; some reasonably smart palates have been involved in getting the data; and there are multiple years' worth of data to look at. The weakness is that it's sensory analysis and not chemical, and also that faults such as reduction and brettanomyces may well be under-reported, as well as the possibility of false positives.
One of the exciting things about the paper is that it will contain a regional breakdown. Some countries are over-delivering oxidized wines, bretty wines, and wines with reduction defects.
There's a limit to what I can say about the data here, because they aren't mine to share. But I can say (and these are provisional figures from an ongoing analysis, so please don't quote them elsewhere) that cork taint is hovering around 3% all three years. Screwcap reduction is around 2.5%, but going down. With 2008, it seems that winemaking faults are overtaking closure faults as the chief cause of problems. Around 7% of wines entered into the challenge show some sort of fault, which isn't really good enough.