ASTM D7305 - 08a(2013)
Standard Test Method for Reflection Density of Printed Matter
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Significance and Use
6.1 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.
6.2 This test can be used to help achieve consistent color reproduction of printed color on flat surfaces.
6.3 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. Scope
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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM Standards
E284 Terminology of Appearance
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
ANSI Standards
CGATS.11-1999 Graphic Technology -- Certified Reference Materials for Reflection and Transmission Metrology - Documentation Requirements and Recommended Procedures CGATS.4-1993 Graphic Technology - Graphic Arts Reflection Densitometry Measurements -- Terminology, Equations, Image Elements and Procedures CGATS.6 Graphic Technology -- Specifications for Graphic Arts Printing PH 2.17 Geometric Conditions for Reflection Density PH 2.18 Spectral Conditions for the Measurement of Optical DensityOther Standard
DIN 16536-2:1986 Testing of prints and printing inks in graphic technology -- Colour density measurements on on-press or off-press printsUNSPSC Code
UNSPSC Code 60121800(Printing and drawing inks); 14121901(Standard newsprint)
Referencing This Standard
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DOI: 10.1520/D7305
Citation Format
ASTM D7305-08a(2013), Standard Test Method for Reflection Density of Printed Matter, ASTM International, West Conshohocken, PA, 2013, www.astm.org
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