Color change perfume systems
First Claim
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1. A colour change perfume system comprising (1) a volatile acid or base, (2) a perfume adapted to pass into the atmosphere at a selected rate, and (3) a pH indicator, the volatile acid or base being selected and being present in such amount as to volatize at about the same rate as the perfume, thereby causing the pH indicator to change colour when the perfume is effectively exhausted.
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Abstract
This invention provides a color change perfume system in which color is caused to change when the perfume in the system is effectively exhausted to the atmosphere. The invention also provides air fresheners and the like consisting of a porous carrier impregnated with the perfumed color change system.
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Citations
16 Claims
- 1. A colour change perfume system comprising (1) a volatile acid or base, (2) a perfume adapted to pass into the atmosphere at a selected rate, and (3) a pH indicator, the volatile acid or base being selected and being present in such amount as to volatize at about the same rate as the perfume, thereby causing the pH indicator to change colour when the perfume is effectively exhausted.
- 11. A colour change perfume system comprising (1) an alkali which reacts with carbon dioxide absorbed from the air, (2) a perfume adapted to pass into the atmosphere at a selected rate, and (3) a pH indicator, the alkali being selected and being present in such amount as to react with carbon dioxide at about the same rate as the perfume passes into the atmosphere, thereby causing the pH indicator to change colour when the perfume is effectively exhausted.
- 13. A system as claimed 11 in which the system is clear and aqueous and comprises a surfactant and a solvent selected to enhance the solubility of the perfume in water.
Specification