Tamper evident document and use thereof

Details Tamper evident document and use thereof Tamper evident document and use thereof

1986-06-24

1989-07-11

Bell, Paul A.

Printed matter

Banking

282 9R, 283 59, 283 94, 283 96, 283 95, 283901, B42D 1500

Patent

active

048465020

ABSTRACT:
A tamper evident document comprising a support bearing an autogenous coating including chromogenic material isolated from an electron-acceptor color developer material in which the autogenous coating bears a principal image comprising visible indicia of a transfer medium imprinted on the surface of the localized autogenous coating. Tampering with the principal image causes chromogen to react with the electron-acceptor color developer material to provide a color indication of tampering. The tamper evident document can be part of a multi-ply record system comprising a plurality of sheets in superposed relationship, comprising a first sheet including a support bearing an autogenous coating including chromogenic material isolated from an electron-acceptor color developer material, said localized autogenous coating bearing a principle image comprising invisible indicia of a transfer medium imprinted on the surface of said localized autogenous coating, and a second sheet including a support bearing a coating of a transfer medium on the first side of said support, said second sheet being positioned adjacent said first sheet with said first side adjacent and in superposed relationship to said autogenous coating such that when pressure is applied to the second side of said second sheet transfer medium in the form of visible indicia is imprinted onto said autogenous coating, wherein tampering with said principal image causes chromogen to contact with said electron-acceptor color developer material to provide a color indication of tampering.

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(Anonymous) "Security Document"; Research Disclosure; No. 187, Nov. 1979, pp. 638, 639.

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