Vision is one of our stronger senses - the phrase “seeing is believing” exists for a reason! Studies have shown that in the presence of visual stimuli, olfaction takes a backseat. That being said, like all senses, they’re still connected.
We find that connection is especially powerful when it comes to smells and colours. People with synesthesia actually have colours or shapes that appear to them when they smell something, but studies have shown that even people without synesthesia can experience something similar, just in a slightly less visceral way.
On the Lore Perfumery shop floor, we’ve found colour is something a surprising amount of people bring up when they smell something. It may be that our brains make a multisensory link - for example, a rose fragrance may smell red to someone because they know the smell of rose and also know that roses are red. Another example is “green” fragrances or fragrance notes, referring to scents that smell like things that are green in nature - cut grass, moss, herbs, etc.