Security marking method and composition

Details Security marking method and composition Security marking method and composition

1993-05-28

1995-06-06

Klemanski, Helene

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 21A, 106 22B, 427 7, 427145, 427157, C09D 1100, B41M 314

Patent

active

054218691

ABSTRACT:
A security marking method comprises marking a portion of the substrate by applying a first marking fluid which is invisible to a unaided eye when illuminated by both visible light and ultraviolet light and activating the marked portion by applying a second marking fluid thereon. The second marking fluid is reactable with the first marking fluid to be invisible to an unaided human eye when illuminated by visible light and fluorescent when illuminated by ultraviolet light. The invention also includes the composition comprising the first and second marking fluids.

REFERENCES:
patent: 3886083 (1975-05-01), Laxer
patent: 4015131 (1977-03-01), McDonough et al.
patent: 4186020 (1980-01-01), Wachtel
patent: 4188431 (1980-02-01), Sokol et al.
patent: 4205865 (1980-06-01), Lange et al.
patent: 4243694 (1981-01-01), Mansukhani
patent: 4322466 (1982-03-01), Tomlinson
patent: 4610806 (1986-09-01), Rosen
patent: 4629630 (1986-12-01), Deyrient
patent: 4631203 (1986-12-01), Schaefer et al.
patent: 5135569 (1992-08-01), Mathias

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