Leach resistant ink for protecting documents from alteration and

Details Leach resistant ink for protecting documents from alteration and Leach resistant ink for protecting documents from alteration and

1989-12-13

1991-10-22

Dixon, Jr., William R.

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing chemical

106 21, 106 25, 106162, 428 29, 428916, 162140, B42D 1500, C09D 1100, B44F 112

Patent

active

050589253

ABSTRACT:
An initially colorless, chemically sensitive protective ink which can be readily printed or applied onto a document substrate and which reacts upon contact with an oxidizing agent to form a noticeable color change is provided. The protective ink, when printed onto a document, resists leaching by water for an extended period of time, both before and after contact with oxidizing agents, and provides visible evidence of any attempted tampering. The leach-resistant ink includes a colorless material which becomes colored upon contact with an oxidizing agent and a complexing agent which reacts to form a complex with the colorless material. A fixing agent which promotes insolubilization and fixing of the complex to the document substrate is also provided.

REFERENCES:
patent: 3886083 (1975-05-01), Laxer
patent: 4156776 (1979-05-01), Mufti et al.
patent: 4618402 (1986-10-01), Camus

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