Color fastness is one of the important indicators of ribbon quality for ribbon manufacturers. Color fastness is an indicator of whether the quality of the ribbon is good or bad. The problem of producing discolored ribbon by ribbon manufacturers can be large or small. If the ribbon used for clothing accessories is discolored during washing, it will contaminate the entire garment or the clothes washed together. So how to evaluate the color fastness of the ribbon?
The evaluation of color fastness generally adopts the visual evaluation method, which uses the gray sample card as the standard sample, and compares the gray card and the sample with human eyes under certain lighting and environmental conditions to determine the original color change and white cloth staining level of the sample. Grey cards (color change and staining respectively) have five fastness levels, namely 5, 4, 3, 2, and 1. Level 5 is good, level 1 is poor. Add another half level in every two levels, namely 4 5, 3 4, 2 3, and 1 2. Therefore, our daily gray scale is 5 levels and 9 levels, and the color fastness evaluation result is one of the 9 levels. If the color fastness of a ribbon product does not meet the standard level, then the ribbon product is considered unqualified.
Among various color fastness items, the most commonly used ones currently include color fastness to rubbing, sweat, washing, light, water immersion, brushing, and climate. In practical life, the assessment items are mainly determined based on the final use of the product. Among them, sweat resistance, dry friction resistance, and color fastness to water immersion are the basic safety technical specifications for textiles, and all dyed textiles should be assessed.