How can the requirement for less than 90% ink coverage be measured?
Ink coverage relates to the density of the ink, not the amount of the page covered by ink. Printers and agencies should know the density of the inks used and how it is measured. Ink density is important because, if an ink is too dense, it cannot easily be removed during the recycling process to create white paper. ‘De-inking’ requires extra processing (and energy) and results in residues that can contaminate. Ink coverage is expressed as an average percentage of the sum of the percentage coverage of each individual ink used. For example: Cyan 20% + magenta 30% + yellow 60% + black 10% = 120/4 = 30%. This example of determining ink coverage is based upon a four-colour set of inks. Similar calculations apply for the various alternative dot patterns that are used.,However, if any individual ink is over 90% coverage then it doesn’t comply with this requirement and automatically fails. An ink at a density above 90% cannot be used in an average percentage calculation to reduce the overall de
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