| 摘要 |
PRESSURE-SENSITIVE COPYING MATERIAL COMPRISES A SUBSTRATE CARRYING ISOLATED DROPLETS OF AN OIL SOLUTION OF CHROMOGENIC MATERIAL COFINED WITHIN RESPECTIVE PRESSURE-RUPTURABLE BARRIERS. THE CHROMOGENIC MATERIAL DEVELOPS A COLOUR OTHER THAN BLUE OR BLACK ON CONTACT WITH COLOUR DEVELOPER AND COMPRISES A COMPONENT WHICH IS FLUORESCENT. THIS ENABLES THE AUTHENTICITY OF THE COPYING MATERIAL TO BE VERIFIED BY IRRADIATION WITH ULTRA-VIOLET LIGHT TO PRODUCE FLUORESCENE. THE FLUORESCENT MATERIAL CAN BE, FOR EXAMPLE 2, 2-BIS (4-<2-[4-DIETHYLAMINOPHENYL]-QUINAZOLIN-4-YLOXY>PHENYL) PROPANE OR 1-(3-METHOXY-4-DODECYLOXYPHENYL)-2-(2''''-QUINOLYL) ETHYLENE. NON-FLUORESCENT CHROMOGENIC MATERIAL(S) ARE PREFERABLY USED IN COMBINATION WITH THE FLUORESCENT CHROMOGENIC MATERIAL(S).
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