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Color change perfume systems

  • US 4,128,508 A
  • Filed: 06/22/1977
  • Issued: 12/05/1978
  • Est. Priority Date: 07/02/1976
  • Status: Expired due to Term
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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