ASTM D7305-08

The appearance properties of printed matter, such as color and gloss, and performance properties such as resistance to abrasion and chemicals, are sensitive to the thickness of the ink film on the substrate. This test, which can be used in the pressroom or laboratory, provides a convenient method for monitoring the ink film thickness equivalence among printed color on flat surfaces.

This test can be used to help achieve consistent color reproduction of printed color on flat surfaces.

Transfer of density readings from one set of inks to another, or from one substrate to another, carries a high risk of producing a color or tone shift. It is not in the scope of this test method to use density readings as digital proof of target points for printing process control.

1.1 This test method describes a procedure for measuring reflection density of printed matter using a reflection densitometer or spectrodensitometer.

1.2 This test method is intended primarily for process colors (yellow, magenta and cyan) and black. With appropriate instrumentation, it may also be used for other colors.

1.3 This test method applies to prints made by any printing process on a flat surface, with reflection density values ranging from just above zero, on the unprinted substrate, through to around 2.5 for very dense prints.

1.4 This test method can be used for prints on paper, film or board but not for those on metal or foil. It can be conducted in the pressroom or laboratory.

1.5 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.