Security document with reversibly photochromic printing inks
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United States of America Patent
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Sep 15, 1998
Issued Date -
N/A
app pub date -
Jun 17, 1996
filing date -
Jan 12, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Photochromic printing inks are disclosed which are in particular used for the printing of security documents. Prints are normally nearly colorless and become colored when energy irradiated, such as by ultraviolet light. This photocoloration is reversible. The printing inks contain photochromic compounds which are protected against other ink components. Methods are described to prepare the inks, to print security documents, and to detect counterfeiting.
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