Imprint sheets of a self-copy set

For better recognition of forgeries the invention proposes an imprint sheet of a self-copy set which on one of its sides has an i mprint layer containing a dye coupling developer used for reacting with colorless dye precursors. The imprint layer also contains one or more dye precursors in solid form...

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Bibliographic Details
Main Authors GUNTER GABEL, REINER MULLER, WOLFRAM FRIESEN, MICHAEL HIRT
Format Patent
LanguageEnglish
Published 26.06.1996
Edition6
Subjects
COLOUR PRINTING
DECORATIVE ARTS
LINING MACHINES
PERFORMING OPERATIONS
PRINTING
PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES
SPECIAL DESIGNS OR PICTURES
STAMPS
TRANSPORTING
TYPEWRITERS
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Summary:For better recognition of forgeries the invention proposes an imprint sheet of a self-copy set which on one of its sides has an i mprint layer containing a dye coupling developer used for reacting with colorless dye precursors. The imprint layer also contains one or more dye precursors in solid form which are freely accessible and not isolated from the dye coupling developer and which constitute not more than 1 wt.% relative to the dye coupling develo per.
Bibliography:Application Number: AU4176696