1.1 This practice covers the procedure for preparing laboratory prints of paste inks utilizing an offset color Proofing Press. The initial method was developed by the National Printing Ink Research Institute.
1.2 This practice is applicable to the preparation of single-color solid-area prints by the dry offset process on a flat substrate such as paper or metal. It can readily be adapted to print by direct letterpress.
1.3 This practice is applicable primarily to lithographic and letterpress inks that dry by oxidation or penetration. With the addition of appropriate drying or curing equipment, it is also applicable to other systems such as heat-set or energy-curable.
1.4 The instructions in this practice are intended to minimize the within-print and among-operator variability inherent in hand operations.
1.5 This practice does not measure the actual film thickness on the print, but evaluates film thickness equivalence by visual or instrumental comparisons of optical density.
1.6 Values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the users of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific precautions are given in Section 7.
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