Air freshener with consumption and end of life indicator

Air freshener with consumption and end of life indication
In air freshener, volatile molecules responsible for aromatization are liquid or, in a lot of cases (for slowing down the release process), embedded in solid matrix or gels

The volatile molecules released from domestic air care devices are blends of different molecular entities, with different chemical properties (acidic/basic, lipophilic/hydrophylic) which implies that it is difficult to find a common chemical reaction that can visualize, for example with color appearance, the consumption or the end of life of the device. Also different matrices are used, thus creating a multiplicity of combination of chemical interaction.

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