| 摘要 |
<p>PURPOSE:To raise a degree of difficult for recognizing a data mark part at least where visual observation is taken as a reference by designing a consealing structure while a read function of the data mark part is being maintained for a data-concealing card, especially a card which is processed for concealing a peculiar write data capable of being judged with a card reader. CONSTITUTION:The title data concealing card is constructed by containing as follows : a data mark part BD absorbing light L and a space part WD reflecting said light L are provided to a card substrate 11 : the data mark part BD abovementioned is covered by concealing substance 12 processed by additive color printing based on printed substance R, B, Y of which lightness color transmitting time light L is adjusted, : a ground tint printed layer 12A generated by a ground tint printing process is contained in the concealing substance 12 abovementioned : a part of substrate color exposed to the upmost layer of the concealing substance abovementioned 12 is a residue of a drop out ground tint part 12B generated by the around tint printing process when the data mark part BD abovementioned is formed.</p> |
