Strong Suit: Reading Fragrance Concentration Before You Buy at the Airport

Stand in front of the fragrance wall at Heathrow T5, or the oddly calm counter at Bristol, and the labels start to blur. Two bottles, both 50ml, both from the same house. One says Eau de Toilette, the other Eau de Parfum, and there is £16 between them. The obvious move is to assume the dearer one is better. The smarter move is to work out what you are actually paying for — and whether you want it.

Concentration is the most useful piece of information on a perfume box and the most loosely policed. It tells you roughly how much perfume oil is in the juice, which shapes how loud it is, how long it lasts and how it behaves on a plane, in a hot country or on a cold British high street. Get comfortable reading it and the airport shelf stops being a wall of pretty glass and becomes a comparison you can actually win.

The letters are a rough guide, not a rulebook

Most of us were taught a tidy ladder: eau de cologne, then eau de toilette, then eau de parfum, then parfum. In practice the rungs are wide and wobbly.

As a rough sketch, colognes often sit somewhere around 2–5% perfume oil, eau de toilette around 5–15%, eau de parfum around 15–20% and parfum or extrait anywhere from 20% upwards. But there is no single UK or EU rule forcing a brand to hit a number before it prints EDP on the carton. Houses use the terms as marketing as much as chemistry, and a well-built modern EDT can outlast a thin, sharp EDP without breaking a sweat.

The other thing concentration does not tell you is how the thing smells. A 20% extrait built on citrus and light musk can sit closer to the skin than a 10% EDT loaded with oud, amber and vetiver. Oil percentage is a starting point. Base notes, fixatives and your own skin are the rest of the story.

Why the airport shelf skews strong

Notice how often the travel-retail exclusive is the intense version. The parfum flanker. The refillable 100ml with the heavier cap. That is not an accident.

Airport buying is often a bigger, more deliberate purchase than a Saturday spritz in Boots. It is a gift, a honeymoon bottle, a treat before a long-haul. Brands know the shopper wants something that feels like an upgrade, and a higher concentration label does that job neatly. Travel retail also leans towards larger formats, where a stronger juice justifies the price gap against the 30ml on the high street.

Which is fine — as long as you check whether the exclusive is a genuinely different formula or the same juice in a fancier flacon. Look at the small print under the name, not just the big letters. A flanker called something like Intense or Le Parfum is usually a real reformulation. A 'travel exclusive' etched on the glass may just be a bottle change and a gift box.

Compare wear-time, not price per millilitre

Here is the calculation worth doing on your phone before you queue.

Say a 50ml eau de toilette is £55 and gives you four decent hours. That is roughly £13.75 an hour. A 50ml eau de parfum at £75 giving eight hours works out nearer £9.40 an hour. Suddenly the expensive bottle is the cheaper one.

Now flip it. If you are buying for daytime office wear and you genuinely prefer a light, bright citrus that you top up at lunch, the EDT is not worse value — it is simply built for a different job. The mistake is comparing them on the ticket price alone and assuming the numbers settle the argument. They do not.

A few practical rules for the counter:

• Compare like with like. Same house, same volume, ideally the same scent family.
• Test on skin, not paper. Card strips flatter everything and tell you nothing about dry-down.
• One wrist per bottle, maximum. More than two and you will lose the plot somewhere near security.
• Give it twenty minutes. The opening is the least useful part of a fragrance, and airports are full of distractions that make you buy on the first spray.

The counter-side checklist

Before you hand over the boarding pass, run through this:

What exactly does the label say? Read the full name. Eau de Parfum and Eau de Parfum Intense are different products, and the price difference is not always reflected in the font size.

Is the exclusive actually exclusive? Ask the assistant directly whether the juice differs from the standard version. A good one will tell you.

Where is it going? Heat makes everything louder. A heavy extrait that feels cosy in Manchester in November can turn into a weapon in Marbella in July. Conversely, a light cologne that is perfect in Dubai may vanish on a wet Tuesday in Leeds.

Who is it for? If it is a gift and you are unsure of their taste, eau de parfum is the safer middle ground — it lasts on the skin and reads as a proper present. If it is for yourself and you like variety, a lighter concentration you can reapply is often the more enjoyable buy.

Will it fit your bag? The 100ml cabin rule still applies at plenty of UK airports in 2026, scanners or no scanners. A 200ml parfum is a lovely object and a terrible hand-luggage companion.

Do you actually want to smell like this for eight hours? It sounds obvious. It is the question most of us forget to ask.

Choose by job, not by label

For a long-haul flight, go lighter than you think. Cabin air is dry and recirculated, and a big parfum can feel claustrophobic by hour six. A soft eau de toilette or cologne, reapplied once before landing, is a kinder travelling companion.

For a city break, eau de parfum hits the sweet spot — enough presence for dinner, not so much that you overwhelm a taxi.

For a daily signature, pick the concentration you will happily wear on a Wednesday. That is usually eau de parfum in winter and eau de toilette in summer, but if your skin eats fragrance, adjust accordingly.

For a gift, buy the stronger end of the range and include the receipt. Duty-free returns are more awkward than the airport would like you to believe.

The short version: concentration is a decent clue, not a verdict. Read the whole label, spray it on yourself, wait twenty minutes and do the wear-time maths. The bottle that earns its place in your bag is the one that matches how you actually live — not the one with the most confident-looking letters on the box.