Why the Scent Fades an Hour In
A candle that smells vivid when you light it and ghostly an hour later isn't necessarily failing — but the reason it fades matters.
Two Culprits, One Symptom
The first cause is chemical. Fragrance oils are blends of many aromatic compounds, and those compounds don't all evaporate at the same rate. The lightest, most volatile elements — citrus notes, fresh herbs, watery accords — hit the air fast and dissipate just as quickly. What remains after forty minutes may be the slower, heavier base notes, which can seem quieter simply because they're less sharp. This is the fragrance's natural volatility curve, and it's baked into the formula. A well-constructed blend staggers those evaporation rates deliberately; a cheaper one front-loads the impact and fades badly.
The second cause is you. Olfactory fatigue — the way your nose stops registering a continuous scent — is real, rapid, and frequently mistaken for the candle going wrong. After roughly fifteen to twenty minutes of uninterrupted exposure, your receptors for that specific scent begin to habituate, and the fragrance seems to drop away. Step outside for five minutes and come back: if the scent hits you again on re-entry, the candle is still working fine. You'd simply stopped noticing.
Most fading experiences are olfactory fatigue. Genuine throw drop — where the fragrance output actually diminishes — tends to happen in candles with a poorly developed melt pool, where not enough liquid wax is reaching the wick to carry fragrance into the flame. That's a different problem, with a visible sign.
Knowing which is which saves you from blaming a decent candle, or from defending a poor one.