Final answer:
The term 'perle de se' appears to be a typo or miscommunication, instead the explanation of perfume concentration levels and how they affect the fragrance's intensity and longevity is relevant. Perfumes are categorized by the concentration of aromatic compounds and described in notes similar to a musical metaphor: top, middle, and base notes.
Step-by-step explanation:
The question seems to be asking about the term 'perle de se' which is not recognized in the context of fragrances. Instead, the discussion of fragrances, their compositions, and their properties may be the key points of interest. Perfumes, colognes, and aftershaves are complex mixtures consisting of essential oils or aroma compounds, which are responsible for their fragrances, dissolved in solvents such as ethanol or water and ethanol mix. The concentration of the aromatic compounds dictates the intensity and longevity of the fragrance.
Perfume (parfum or extrait) is the highest concentration of aromatic compounds, typically between 15-40%, making it the most potent and long-lasting form. Eau de parfum (EdP) has a slightly lower concentration of 10-20%, still known for its persistence. Moving down the scale, eau de toilette (EdT) contains 5-15% aromatic compounds, commonly used for masculine scents. Eau de cologne (EdC), or simply cologne, is even lighter with 3-8% aromatic compounds, and finally, eau fraiche has 3% or less and is mostly water-diluted.
Perfumes are described using musical metaphors of notes: top, middle, and base. These represent the layers of scents that unfold over time during the evaporation process of the perfume. The overall harmony of a perfume is what provides the unique scent accord.