On the other hand, we desire to produce a product that will specifically not fool a copier, and in fact we desire to accentuate the difference in halftones in order to cause the previously hidden words to “pop” on the copied document. In other words, at arms length, we want our “void” words to be fully concealed in a background pattern or screen. Further, in a security screen area, these varying halftones overlap one another yet the desired outcome is to fool the human eye in order to make them appear to be consistent in the authentic document. What makes security document manufacturing different than other commercial print jobs lies in the fact that every security screen contains at least two different halftones (a halftone is represented by a screen lineage value, a screen angle, a dot shape, and a density value).
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