The Brochet experiment - how sight overrides the taste of wine
Imagine handing a group of oenology students two glasses of wine, white and red, and asking them to describe them. Sounds like a simple tasting, right? And now imagine that both glasses contain exactly the same white wine, only one has been dyed red with a tasteless coloring. Even so, the subjects described the supposedly red wine with vocabulary typical of red wines, although the glass held ordinary white. This is the famous Brochet experiment, one of the strongest pieces of evidence of how much sight steers our perception of taste. It shows that even experts are fooled by color. Here is what Brochet really studied, what came of it and what practical lesson this story carries for anyone who wants to taste wine thoughtfully.
What the experiment consisted of
The experiment was conducted by the French researcher Frederic Brochet at the University of Bordeaux, in an environment that knows wine like few others. A sizeable group of students of oenology, that is the science of wine, took part in it. The idea was brilliantly simple. Brochet served the subjects a white wine and asked for its description, and then served the same white wine, but dyed red with a tasteless food coloring. The subjects did not know that in both cases they were dealing with the same drink. They were simply to describe what they sensed. The whole trick was that the only real difference between the glasses was the color, not the taste or aroma. This made it possible to check whether the mere appearance of the wine would influence how people described its taste and smell.
The surprising result
The result turned out to be astonishing. When the subjects described the white wine as white, they used terms typical of it, speaking of freshness, citrus fruits or floral notes. When, however, they described the same wine dyed red, they reached for vocabulary characteristic of red wines. They wrote of notes of red fruit, intensity, spices and other features we associate with red wine. In other words, the mere change of color made people describe an identical drink completely differently. Their perception of taste and smell followed the color, not the actual contents of the glass. This showed that sight is not a passive addition to tasting but actively shapes, indeed overrides, what we perceive with the nose and palate. Color turned out to be a powerful signal that literally reprogrammed the description of the wine.
Why this matters so much
One might think this is just a curiosity, but the conclusions are profound. The subjects were not random people but oenology students, that is people learning to professionally evaluate wine. If anyone was to be immune to such a trick, it was precisely them. And yet they too were fooled by the color. This shows that the influence of sight on taste is not a matter of a lack of experience or knowledge but a fundamental feature of human perception. Our brain does not receive taste in isolation but combines information from all the senses into one image. The color of wine is a strong cue that the brain takes very seriously, sometimes more seriously than the signals from the palate itself. This is why the Brochet experiment is so often cited. It makes us realize that objective evaluation of taste is far harder than it seems, because our senses constantly influence one another.
How the brain combines the senses
To understand this effect, it helps to know how our perception of taste works. What we call the taste of wine is in reality a complex impression arising from the combination of taste, smell, texture, and also sight and expectations. The brain does not analyze each sense separately but merges them into a coherent whole. Color is one of the first signals we receive, even before we sense the smell or taste. So it acts as a frame in which the brain places the further impressions. When we see red wine, the brain prepares in advance for the profile of a red wine and interprets the subsequent signals in this context. This is not a conscious choice or a deception but an automatic mechanism. This is why, even knowing about this effect, it is hard to free oneself from it. Sight sets the expectations, and the expectations shape what we actually sense in the glass.
Brochets other research
The experiment with dyed wine is not Brochets only work on the power of expectations. In another well-known study he showed how the evaluation of wine is influenced by the label and the belief in its prestige. When the same wine was served once as cheap and once as expensive and prestigious, the descriptions differed diametrically. The supposedly expensive wine was praised and described in superlatives, while the same wine served as cheap met with cooler, less flattering terms. This complements the picture from the color experiment. Together these studies show that our perception of wine is influenced not only by the drink itself but by the whole informational environment: the color, the label, the price and our expectations. Brochet consistently proved that tasting is a psychological act as much as a sensory one, and that objective evaluation requires consciously cutting oneself off from these signals.
Does this mean tasting is worthless
Here one must keep balance and not draw overly hasty conclusions. The Brochet experiment does not prove that tasting is pointless or that experts can do nothing. It proves something else, namely that human senses are susceptible to suggestion and that context strongly influences evaluation. This is an important difference. Experienced tasters really can pick up many features of wine, but only when they are aware of the traps and able to cut themselves off from them. This is precisely why blind tasting exists, in which labels are covered, and sometimes even the color of the wine. It is a method of defense against exactly the mechanisms that Brochet revealed. The experiment therefore does not undermine the art of tasting but points to its limits and reminds us how important the conditions in which we evaluate wine are, if we want the evaluation to be reliable.
How to use this knowledge in practice
Awareness of the Brochet effect can really improve the way you taste wine. First, it is worth remembering that the first impression is always tainted by context, including color, label and price. Second, if you want to evaluate a wine more objectively, try tasting in conditions that limit these cues, for example by covering the label. Third, you can consciously practice separating the senses, trying to describe wine solely on the basis of smell and taste, regardless of what sight suggests. It is a difficult but instructive exercise. Finally, it is worth simply accepting that pleasure from wine is the sum of all the senses and context, and that there is nothing wrong with that. The problem arises only when we confuse an impression driven by suggestion with an objective evaluation of the quality of the drink itself.
A lesson in humility for everyone
The Brochet experiment is above all a lesson in humility. It shows that no one, not even an expert, is fully immune to how the senses and expectations influence one another. This is no cause for shame but for greater awareness. The next time you are delighted by a wine, it is worth asking yourself how much of that delight comes from the glass and how much from a beautiful label, a high price or the mood of the moment. This question does not spoil the pleasure but makes it more conscious. Humility toward ones own senses also protects against overpaying for prestige and against giving in to marketing. The best tasters are not those who believe they are infallible but those who know the traps of their own perception and can take them into account in their evaluation.
What this story teaches us
The story of the Brochet experiment reaches beyond the world of wine. It is a universal tale of how our senses cooperate and how easily they are suggestible. It concerns not only wine but also coffee, beer, tea or food. Everywhere there, color, appearance, packaging and expectations influence what we sense. For the thoughtful connoisseur this is invaluable knowledge, because it allows separating real quality from suggestion. It is not about becoming a distrustful cynic but about tasting with open eyes and an open mind, understanding what is really happening in our head during a tasting. This makes the experience richer and more authentic, while also protecting against an easily exploited naivety toward color, label and price.
Key takeaways
The Brochet experiment showed that the color of wine can override our perception of its taste. When the researcher dyed white wine red, experienced oenology students described it with vocabulary typical of red wines, although the glass held ordinary white. It is proof that sight and expectations strongly shape taste, and even experts are not immune to it. The lesson does not undermine the art of tasting but points to its traps and the sense of blind evaluation. The most important thing is to taste with awareness of the influence of context. If you want to practice reliable tasting and record your impressions, GustoNote will guide you through it.