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Single phase color change agents

  • US 7,651,989 B2
  • Filed: 08/29/2003
  • Issued: 01/26/2010
  • Est. Priority Date: 08/29/2003
  • Status: Active Grant
First Claim
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1. A liquid cleansing formulation comprising:

  • a base material, the base material comprising water and a surfactant;

    a reducing agent, wherein the reducing agent includes a sugar; and

    a redox dye, wherein the ratio of the reducing agent to the redox dye is at least about 5 to 1 and wherein the redox dye is present in the cleansing formulation in an amount of from about 0.001 to about 0.5 weight percent and the reducing agent is present in the cleansing formulation in an amount of from about 0.1 to about 2.0 weight percent;

    wherein exposure of the liquid cleansing formulation to an excess concentration of oxygen causes oxidation of the redox dye and produces an observable color change.

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