SESH · ADVANCED FRAGRANCE ACADEMY
Analyze suppression, enhancement and emergent accord effects without assuming chemical reaction.
Follow the route from the nasal cavity to the olfactory bulb. Smell is perception; it does not independently identify a perfume’s ingredient list.
What sensory masking means
Masking occurs when one odor reduces the detectability or prominence of another. The obscured component may still be present chemically. A sharp woody facet can hide a delicate fruit note without destroying its molecules. A perceptual effect is not evidence that a chemical reaction removed an ingredient.
Enhancement and synergy need careful definitions
A mixture may produce an impression stronger or qualitatively different from its individual components. Yet 'synergy' requires an operational comparison to an expected additive model, not simply 'the combination smells good'. Distinguish enhancement, pleasantness, and scientifically demonstrated non-additive interaction.
Emergent perceptual character
Blending floral, creamy and woody facets can yield a cohesive impression that is harder to parse than the components alone. This emergent perceptual character need not involve formation of a new chemical substance. Describe the whole accord and the recognizable parts separately, allowing uncertainty.
Linalool contains an OH alcohol group. One functional group is insufficient to predict every molecule’s odour or the performance of a mixture.
Open full-size image ↗Adaptation is a confounder
Continual exposure to one odor can reduce sensitivity, making another facet appear stronger. Use rest periods, comparable doses, counterbalanced order and more than one observer when possible. Changing attention and adaptation can mimic an apparent mixture interaction; never infer one mechanism from impression alone.
Design an interpretable comparison
Compare coded A, B and A+B conditions while tracking the total applied dose. A mixture with more total material can look stronger for simple dosing reasons. Rather than asserting synergy, report a bounded result such as 'this panel rated the blend creamier under these conditions'. That can be examined and repeated.
Case: perceptual disappearance
Imagine a berry note is obvious in A and oud-like wood in B. In A+B most observers report wood and no berry. The defensible description is perceptual masking, not chemical destruction of berry materials. Report the panel findings rather than claiming an ingredient was erased.
Practical desk-based exercise
Use a hypothetical A/B/A+B panel table: descriptors, intensity, equal-dose status and possible masking or enhancement. Propose a follow-up trial that distinguishes competing explanations.
Three diagrams summarizing the lesson
Three mixture outcomes
- Masking: a facet becomes harder to detect
- Enhancement: increased prominence
- Emergence: a new perceptual whole
Controlled A/B/blend test
- A alone
- B alone
- A+B with documented dosage
- Rest and sample-order control
What sniffing alone cannot prove
- Chemical reaction
- Ingredient elimination
- Exact ingredient percentage
Scientific terms
- Masking
- Reduced perceptibility of an odor in the presence of another.
- Synergy
- Nonadditive interaction established relative to a defined model.
