Security marking method and composition
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United States of America Patent
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May 14, 1996
Issued Date -
N/A
app pub date -
Jun 5, 1995
filing date -
May 28, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A security marking method and composition wherein a first marking is applied to a surface of a substrate with a mixture of a printing medium and a first composition, wherein the first marking is visible to an unaided human eye and is indistinguishable from a marking applied with the printing medium alone, to an unaided human eye when illuminated by visible light or ultraviolet light. A second composition is added either with the mixture or thereafter, wherein the second composition is reactable with the first composition to fluoresce and wherein the fluorescing is only visible to an unaided human eye when illuminated by ultraviolet light.
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