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How to judge the color fastness of the fabric?
2015-08-24 15:47  Clicks:
The color fastness is an very importent quality standard. The color fastness of the fabric is the color keeping grade under the physical and chemical function. The fastness of the dyed fabric affect by the outside called color fastness. The color fastness is judged by the staining grade of  white fabric and the the color change of test sample after experiment. 
 
Among all the test items of the color fastness, the common fastness is color fastness to rubbing, perspiration, washing, light, water, cleaning, weather proof, etc. In the daily life, the which color fastness to test is decided by the end use of the fabric. The color fastness to rubbing, perspiration, water are the basic safety and technical required items.
 
The evaluate method of the color fastness is visual evaluate. The guide sample is the grey card , compared the grey card and the test sample under the fixed light and environment to confirm the grade of original color change and the the white fabric stain. The grey card is divided into 5 grade, 1, 2,3,4,5. The grade 5 is the best and the grade 1 is the lowest. And between each grade, there will be a half grade, which is 4-5, 3-4, 2-3, 1-2, so the grey card have 5 grade and 9 section. The result of the color is one of the 9 sections. If the color fastness can not meet the grade of standard, the product doesn’t measure up. 
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