In 2001, a curious insurance adjuster in St. Louis noticed something odd in his accident reports. Red cars seemed to be involved in more traffic violations than any other colour. Not just a few more. Dramatically more. Here, global CSO and award-winning strategy leader Leif Stromnes investigates why crimson’s confounding psychological effects.
Intrigued, he dug deeper into the data. What he found was startling: red cars received 18 per cent more speeding tickets than white cars and were involved in 7 per cent more accidents overall. The pattern held across different makes, models, and driver demographics.
This wasn’t because red car owners were inherently more reckless drivers. The colour red was literally making red car owners drive faster.
What the insurance adjuster had stumbled upon was a powerful psychological phenomenon that behavioural scientists call “colour priming.” Colour priming is the unconscious way that colours influence our emotions, decisions and behaviours without us even realising it.
Red, it turns out, is nature’s accelerator pedal.
Throughout human evolution, red has been associated with dominance, aggression, and danger. It’s the colour of blood, fire, and warning signals, such as poisonous berries in the wild. When we see red, our sympathetic nervous system activates, increasing heart rate, blood pressure, and testosterone levels.
In competitive situations, this physiological response can provide a crucial edge.
At the 2004 Olympics in Athens, judges noticed something peculiar about combat sports. In boxing, wrestling and judo, competitors wearing red protective gear won significantly more matches than those wearing blue. The advantage was so pronounced that it couldn’t be explained by skill, training, or luck alone.
Red athletes won 61 per cent of their matches, a statistically significant edge that translated into medals, prize money, and Olympic glory. This effect was so pronounced that Olympic combat sports now randomly assign red and blue uniforms to prevent unfair advantages.
Similarly, Rugby Union player Ilona Maher, who plays for the USA national team, has become famous for her signature red lipstick which she wears whenever she takes the field.
She maintains that it proves you can still be feminine whilst playing the most masculine sports, but her 5.2 million Instagram followers frequently comment that it also makes her look powerful, intimidating and fearless on the field.
At the other end of the emotional spectrum, in 1971, a young interior designer named Alexander Schauss had been asked to find a way to reduce aggression among inmates at the Seattle Naval Correctional Centre.
Violence was escalating, traditional disciplinary measures weren’t working, and the facility was desperate for solutions.
Schauss had a theory that seemed absurd to prison administrators: what if the colour of the walls was making people more aggressive?
He convinced sceptical officials to let him paint two holding cells in an unusual shade of pink – a specific hue he had mixed himself, combining red and white in precise proportions. The colour was so distinctive that he named it after the naval officers who had approved the experiment: Baker-Miller Pink.
The results were immediate and dramatic.
Inmates placed in the pink cells showed measurably lower levels of aggressive behaviour within fifteen minutes of exposure. Heart rates decreased. Muscle tension relaxed. Even the most violent offenders became noticeably calmer.
Word spread quickly through correctional facilities across America. Within five years, hundreds of prisons, psychiatric hospitals, and juvenile detention centres had painted their holding cells Baker-Miller Pink.
The colour became so associated with behavioural control that it earned the nickname “drunk tank pink”.
Just as Pavlov’s dogs were conditioned to salivate at the sound of a bell, humans have been evolutionarily conditioned to respond to certain colours in predictable ways.
The implications for marketing and advertising are profound
In 2002, Heinz discovered this when they briefly changed their ketchup from red to green for a promotional campaign. Despite the product being identical in every other way, sales plummeted. Focus groups revealed that the green colour made the tomato ketchup taste “wrong” to consumers, even though the flavour was unchanged.
Pepsi had a similar revelation when they tested their cola in different coloured cans. The exact same formula was rated as more refreshing in blue cans, sweeter in red cans, and more sophisticated in black cans.
Luxury brands are perhaps the most advanced when it comes to using colour to boost the appeal of their products. For instance, Christian Louboutin’s red-soled shoes aren’t just a design signature; they’re a psychological trigger. The red soles create associations with passion, power, and luxury. Women report feeling more confident and attractive when wearing them, not just because of the brand prestige but because of the colour’s unconscious influence on their self-perception.
What makes colour priming particularly powerful for marketers is its unconscious nature. Unlike other psychological triggers that require active processing, colour priming happens automatically and instantly.
Consumers don’t realise they’re being influenced, which makes the effect more potent and less likely to trigger resistance.
The key insight for marketers is that colour choices aren’t just aesthetic decisions, they’re strategic psychological tools. Every colour sends a message, primes specific emotions, and influences behaviour in predictable ways.
Consumers like to think they’re making rational purchasing decisions based on price, quality, and features, but research consistently shows that up to 90 per cent of snap judgments about the products they buy are based on colour alone.
One important thing to bear in mind when thinking about colour priming as a marketing strategy is that cultural differences can override biological responses.
While red signals danger in Western cultures, it represents good fortune and prosperity in China. White symbolises purity in Europe but mourning in parts of Asia.
The colour priming effect also diminishes with prolonged exposure. People working in red environments eventually adapt to the colour’s influence, suggesting that colour priming works best for brief, high-impact interactions rather than sustained experiences.
Perhaps most importantly, because colour priming works below the threshold of conscious awareness, the moment people realise they’re being influenced by colour, the effect weakens significantly.
The most successful brands, therefore, use colour priming subtly and authentically, ensuring that their colour choices align with their genuine brand values rather than simply exploiting psychological vulnerabilities.
As Alexander Schauss discovered in that Seattle naval prison, when it comes to colour priming, the most powerful influences are often the ones we never see coming.
