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SOLVENTS: are liquids, virtually odorless and colorless, used in perfumery for the dilution of perfume oils. The most commonly-used solvent is ethyl alcohol. Some solvents also have fixative properties.

FIXING: is a process that promotes the retention of the fragrance on the skin as long as possible.

To achieve this, heavy, non-volatile substances are used which develop their full fragrance intensities only very slowly, and maintain them for longer periods. Substances are also used for this purpose which have no strong odors of their own, but have the ability to make other fragrances last longer.

CRYSTALLINE: A certain amount of crystalline fragrance sub stances can be dissolved, without problems, in the, liquid ingredients of a perfume oil. In general they possess good fixative properties. But to( high a percentage of crystalline substances, an( especially low temperatures, can cause what i known as "crystallizing-out"-the appearance o crystals in the liquid.