Iris print

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The iris printing is a special effect printing process both in the planographic printing , in high pressure and in screen printing can be applied and in which the oscillation of the Verreibewalzen is turned off. For example, the three basic colors yellow , magenta and cyan are manually applied to the inking rollers at short, regular intervals . In this way, several colors with overlapping color borders are printed in one printing process.

In this way, in security printing, the motif of a printing plate (for example a guilloche pattern ) is colored in multiple colors, the trituration being set to the lowest possible level. The fine lines of the guilloche then show a course of the colors used (examples: banknotes , visas , personal documents ).

In offset printing , the slow mixing of the basic colors creates a subject that reproduces all the colors in one another.

This effect increases from sheet to sheet until all the colors are mixed together. After that, the only way to restart the process is to wash the rollers and reapply the paint.

Every printed sheet is different and differs from the next due to its individual color gradient structure.

In screen printing, the color is applied in "blobs" to the printing fabric. Thanks to the permanent flood and pressure squeegee , the colors mix in the flood wave in front of the steel squeegee and achieve the same gradient effect as with offset printing.

In order to achieve the desired effect, translucent printing inks are necessary.