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ink trapping

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ink trapping (In French accrochage/prise de l’encre) adhesion of two printing ink layers in wet-in-wet offset printing; measure for the mottling propensity (cloudiness) as well as for the ink splitting of the transferred printing ink between the blanket and the preceding printed layer of ink. Quantification procedure by which the solid densities of the individual inks and of the combined print with the filter of the second-printed ink are measured: ink trapping according to Preucil (DIN 16527, inaccurate); ink trapping according to Ritz (“bead factor”, because poor ink trapping becomes apparent in a beaded printout); ink trapping according to Brunner (most accurate): The higher the percentage, the better the ink trapping; if ink trapping is too low, possibility of change in the color sequence or use of wide-format ink absorbency strips in the trim.