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Wine faults

Running a wine faults class: should you use faulty bottles or spiked wines?

By May 16, 2025One Comment

Running a wine faults class can be one of the most eye-opening experiences for wine professionals and enthusiasts. But let?s be honest?it?s not exactly the most hedonistic tasting session. You are training yourself to identify aromas like wet cardboard, band-aid and vinegar: indications of cork taint, Brettanomyces and volatile acidity, respectively.

But here?s the big question: Do you use naturally faulty wines, or spike neutral wines with flavour compounds to replicate the faults? Let?s explore the pros and cons of both approaches?and why a hybrid model might be the most effective.

?Real? wines

We run into faulty wines from time to time. Why not save up these bottles and run a tasting session?

?Pros:

  • Authenticity: these examples can be very realistic. If you encounter a wine with noticeable ?Brett?, it is likely in a red wine that has seen some oak. You will practice identification of the fault in the wine style that it is most likely to appear in.
  • Variety: Look at various faces of the same wine fault. It could be really interesting to try both a reductive Pinot Noir and a reductive Syrah.
  • Economical: Rather than pouring your corked bottle down the drain, you can repurpose it for your wine faults class.

?Cons:

  • Lack of comparison: It be difficult to find a point of comparison/an unfaulty reference wine. Sometimes it is possible: in the event of a corked bottle, it can be tasted against an additional bottle of the same wine. But how do you find a wine with Brett and compare it with the same wine without Brett?
  • Multiple faults: Faulty wines frequently have more than one fault. For example, wines with high volatile acidity often show notes of oxidation too. Wines with Brett may also show mousiness.
  • Inconsistency. Corked wines are chance encounters ? can you know for sure you will have another corked bottle for your next faults class? Also, where can you buy a bottle of smoke-tainted wine?
  • Time-consuming prep. Considerable time can go into preparing faulty bottles, such as opening a wine and waiting for it to oxidise, or placing a wine in daylight to make it go lightstruck.

Spiked wines

This method relies on an addition of an individual flavour molecule to a neutral base wine ? molecules such as TCA, 4-EP and ethyl acetate. The spiked wine can then be compared to the same wine without any flavour addition.

?Pros:

  • Isolating of faults. You can assess each component of a fault individually. For example, you can break up the fault volatile acidity into its vinegar component and its nail varnish remover component, and try them side-by-side (you can later blend these two samples for the full volatile acidity experience).
  • Determining sensitivity. All tasters, at all levels, have certain ?blind spots? in their sense of smell: you are unable to detect specific flavour molecules. By trying individual compounds one at a time, you can figure out your blind spots.
  • Time-efficient. Dissolving a flavour compound into a bottle of wine is a matter of minutes.
  • Scalability. You could run wine faults classes every day if you wanted to.

?Cons:

  • Cost. High-purity, food-grade flavour compounds for educational purposes are highly specialised materials. This is never cheap.
  • Not always realistic. Spiked wines are not always representative. Typically, an inexpensive product is used as a base wine. Wine styles in this price category are almost never affected by Brett, for example. Adding Brett-type compounds to an entry-level wine may not give you the most accurate teaching example.

We like to combine both methods: running a session using spiked wines first, then get participants to apply their newly acquired skills by identifying faults in real wines.

Yes, we are biased: we sell flavour compounds related to wine faults! However, we have applied this method over and over, and it is highly effective. Get your flavouring vials here.

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