Perfume ingredients definition

To understand perfume behaviour on these surfaces and/or matrices, we must consider the range of attractive or repulsive forces between the perfume components and the surface itself. The situation is complicated by the way in which perfume is delivered to the surface. For example, for a perfume ingredient in a soap bar to be substantive it must first be efficiently delivered to the skin during washing, it must then survive rinsing and, finally, it must be retained for some time on the skin. Definitions of substantivity and of retention vary, but here retention is used to indicate the affinity a perfume has for a substrate when delivered to it, whilst substantivity also includes delivery barriers. 

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