The essence is composed of synthetic and isolated fragrances, natural fragrances, fixatives in varying amounts, and sometimes also contains a certain amount of solvent and carrier according to the needs of the application. Each of these components has its own physicochemical properties, and when mixed together, complex changes occur. These changes are related to the stability of the fragrance.
As far as the essence itself is concerned, if the evaporation rate of its entire volatilization process is relatively balanced, in other words, when the aroma of the essence changes little during the volatilization process of a considerable time, it can be said that its aroma is relatively constant, and it should be considered stable. However, it is not enough to only meet this requirement. It is also necessary to check whether its fragrance can still be relatively stable after it is added to a medium and during use; whether it is basically the same as the fragrance of the original essence (that is, the top fragrance). , whether the evolution of body fragrance and base fragrance is stable), whether its aroma diffusion degree is still similar to that of the essence, whether it has increased or decreased; whether its aroma persistence and fixing effect have changed; whether it will cause the medium to change its shape In terms of color, color, color, clarity, application performance of the medium, whether there is any change with the container material and consumers in the process of use, etc.
