Lightfast ink grade and lightfastness test method
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Lightfast ink grade
The light fastness level is generally divided into 8 levels, the 1st grade is the worst, and the 8th grade is the best. European printing buyers mostly require red and yellow four-color inks to have a lightfastness of 5 or higher, and black and blue require 7 or more; the inks used in the Asian region mostly follow the Japanese hue, but most None of the pigments are more resistant to light, so the yellow and red lightfastness levels are only about 3, but the 3 grades are only general grades. Strictly speaking, they do not meet the lightfast requirements of Europe and the United States.
In summary, the more vivid colors such as fluorescent ink, yellow, radiant blue, gold red, orange, pink, purple, green lotus and other hue inks, the light fastness is mostly below 3; especially with transparent dilute ink The blended light color inks are extremely resistant to the sun.
Light fast test method
The traditional method of testing the lightfastness level uses the blue wool fading as an indicator. Therefore, it is difficult to compare the gray proofing scale and the fading depth of the blue cloth by visual inspection.
Recently, the standards of US printing buyers used Lab and Xenon light boxes to measure the fading of simulated prints after one year. In addition, the color of the past light-resistant ink is not bright enough to keep up with the color of Pantone, and the new light-resistant variety is colorful, can be blended into the color of the Pantone color book, and can be attached to the color matching system database to make the computer color matching. It is easier for users of the system to dispense lightfast inks.