The color fastness of all kinds of projects, the most commonly used color fastness rubbing fastness, perspiration fastness, washing fastness, light fastness, water fastness, washing fastness, weather fastness and other projects. In real life, according to the end use of the product to determine which items including assessment, perspiration, dry friction, color fastness to water is the basic safety requirements of the project technical specification for textile dyeing textile, all should be examined. In addition, for infants and young children textile products, saliva color fastness should be evaluated.
Evaluation of color fastness by visual assessment method, which is based on grey card as standard sample, in a certain light and environmental conditions, with the eyes of the gray card and contrast samples, to determine the sample in the form of color and white staining series. Five color fastness grades are 5, 4, 3, 2 and 1, respectively. Level 5 is best, level 1 is worst. In each two levels to add half grade, that is, 45, 34, 23, 12, so our daily use of gray card is 5 grade 9 files, color fastness evaluation results are 9 grades. If the color fastness of a ribbon product is not up to the level specified in the standard, then the ribbon product is unqualified.
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