ASTM D7305-08a

One of the key properties for printing in the lab or on production equipment is the intensity of the color, color balance and uniformity. This test can be used to ensure that the proper amount of ink is transferred to the substrate by obtaining a target density value, in addition to determining whether the print is uniform by measuring the reflection density over a wide print area. This then allows the use of the print for controlled testing of other appearance properties, such as gloss and color, and performance properties, such as resistance to abrasion and chemicals.

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 standard. No other units of measurement are included in this standard.

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.