| 摘要 |
Illegal reprographic photocopying exists world wide. To fight it, a printing process has been developed which comprises using a pair of different color inks to print texts, figures, and any type of document, the photocopying of which is useless to persons alien to their legitimacy, and in protection of genuine owners interests, or Copyright. To execute this process, two plates or matrixes are prepared; one with any design to print a background or screen and on top of this printing, text or a figure is applied by using another color ink. One of these colors must be metallic ink so that text or figure stands out when contrasting print between reader and observer and natural or artificial illumination source used. Thus, reproductions which can not be photocopied are obtained. In addition, usual way of reading or prints observation are being modified, since reproductions which are produced with the process herein described, requires the reader to position himself in contrast relative to the illumination source for their observation, since metallic ink causes the letter or figure to stand out by reflection.
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