As time goes on, the fragrance is constantly volatile, the volatility of various spices is not the same, also resulted in different time periods have different fragrances. In this way, the basic idea of ​​the perfume structure was formed, and was implemented by Emerson Guerlain in "Ji Qi" perfume in 1889. Since then, the production of large quantities of perfume to take this pyramid (or called three-tier, three-tier and classic) structure. That is, points before the tune of the first incense, the tone of the base tune and tail end of the three basic fragrance stage fragrance stage. ⒈ before the transfer (or call the head tune, the first fragrance, Chu Xiang, before the taste) contains the most volatile components of perfume. It lasts only for a short period of time. After 2000, it usually takes about 10 minutes. The commonly used spices include orange, lavender, mint, lemon and so on. The effect is to give an initial overall impression and attract attention. 2. Middle, also known as the core tone, the taste, followed by the first tone appears, emitting the main fragrance of perfume. It reflects the most important scent of a perfume, usually to maintain a minimum of 4 hours commonly used spices, including jasmine, rose, rosin, lilac and so on. 3. Tail (or call the end of incense, after the tune, deep tone, body scent, Yat incense, bulk incense, after taste) is the most permanent part of the scent, that is, the slowest part of evaporation can be maintained for a day or longer Of the time, fragrant lasting make it a summary of the whole section of perfume. Commonly used spices are frankincense, sandalwood, benzoin and so on. For the sake of description, the main content of the three levels of perfume, often written in the form of pyramids, arranged in segments. Here are two examples. Of course, while most perfumes are described in terms of pyramid-type tonality, there are exceptions, such as the alchemical notes that have their own uniqueness. There is nothing special about other chemical raw materials. So for taxonomists, the pyramid can be used as a more complete guide to perfume structure. When the formula uses pure fragrance ingredients, the perfume division will make a special statement in the pyramid structure. (Such as "tuberose" perfume ad), such perfumes are often high quality and expensive.