Reversible and reusable authentication system for secure documents
AssigneeThe Standard Register Company
InventorsRajendra Mehta, Steven L. Yeager
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Abstract
The invention is a method and system that is useful to authenticate security paper. Specifically, the present invention relates to a method and system that allows security paper to be authenticated more than once without destroying the authentication mechanism. An authenticating solution is applied to a surface of an authentic document or other authentic security paper. Subsequent application of an activating solution to a surface of a document containing the authenticating solution causes a reversible color change allowing the document to be authenticated.
Claims46
A method for authenticating security paper comprising:
- placing an authenticating solution on at least one surface of said security paper, said authenticating solution comprising an acid-base indicator in non-ionic form and having an original pH;
- and
- applying to said surface of said security paper an activating solution comprising an acid or base selected to produce a characteristic color change of said acid-base indicator and thereby authenticating said security paper, wherein said characteristic color change will disappear when the activating solution dries.
A security paper authenticating system comprising:
- a security paper having an authenticating solution on at least one surface of said security paper, said authenticating solution comprising an acid-base indicator in non-ionic form and having an original pH;
- and
- an activating solution comprising an acid or base selected to produce a characteristic color change of said acid-base indicator, wherein on applying the activating solution to said security paper a color change occurs that reverses when said activating solution dries.
Dependencies are inferred from the claim text.