
Individual perfumes often contain a hundred or more ingredients, each of which adds something special to the overall effect. For example, there will be ingredients that provide what are technically known as head or top notes, which have an immediate, rather volatile effect; solid, middle of the range odours, and less volatile, more persistent odours known as the base or lower notes. There are also fixatives - the three main ones used are ambergris, civet and musk - to slow the rate of evaporation...
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