Short answer
A test strip provides a concentrated, local scent source. In a space, the same composition is diluted in a large volume of air and continuously influenced by ventilation, temperature, materials and diffusion technology. As a result, other facets can come to the fore.
On paper, your nose is centimetres from the source
With a blotter, you smell perfume applied to a small surface directly. The first volatile materials in particular can therefore be very distinct.
In a space, you don't experience a single point, but a much lower concentration spread over hundreds of cubic metres of air.
Different raw materials behave differently
Perfume raw materials differ in volatility, diffusivity and intensity. A citrus opening can be brilliant on paper but disappear quickly in a large space. A musk or wood structure, on the other hand, can give more substance when the scent builds up over a longer period.
Air flows don't neatly select top, heart and base
Ventilation continuously removes material and brings in fresh air. Temperature and air movement also influence how quickly components evaporate and where they are perceived.
That is why the spatial balance can differ from the classic development on a blotter.
The space has a scent of its own
Wood, textiles, coffee, cleaning products, kitchens, flowers, people and outside air form an existing olfactory background. The brand scent is experienced on top of that.
A scent that seems perfect in an odourless office can come across differently in a hotel with lots of natural materials.
Why a real space test is essential
The blotter is excellent for selection and comparison. But for professional scent marketing, the final choice must be assessed with the actual device and under normal ventilation conditions.
Sometimes a scent that is less striking on paper turns out to have the most beautiful ambient performance.
Developing scent for diffusion
For custom projects, feedback from space tests can go back to the perfume house. A formula can then be adjusted for diffusion, presence or balance instead of only for blotter performance.