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Color changing compositions for use on non-porous surfaces

  • US 5,478,382 A
  • Filed: 07/05/1994
  • Issued: 12/26/1995
  • Est. Priority Date: 07/31/1992
  • Status: Expired due to Fees
First Claim
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1. A multiple coloring composition system comprising:

  • (a) an undercolor aqueous coloring composition comprising a first film forming resin and an undercolor dye whose coloring ability is destroyed in the presence of a pH of about 10 or greater; and

    (b) an overcolor aqueous coloring composition comprising a second film forming resin, a colorant capable of maintaining its characteristic color in the presence of a pH of about 10 or greater and an effective amount of a base sufficient to yield a pH of said overcolor aqueous coloring composition of about 10 or greater.

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