Colorless fast-drying ink compositions for printing concealed images detectable by fluorescence
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United States of America Patent
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Feb 15, 1994
Issued Date -
N/A
app pub date -
Jul 31, 1992
filing date -
May 16, 1991
priority date (Note) -
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Abstract
Disclosed is an ink composition consisting essentially of water, diethylene glycol-monobutyl ether, glycerol, an optional cyclohexyl pyrrolidinone component, a dye selected from the group consisting of dyes containing dansyl chromophores and dyes containing porphyrin chromophores, an optional biocide, and an optional polyalkylene oxide/bisphenol-A additive.
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