How Many Grades Of Gray Sample Cards Are Used For Fabric Color Change?

The gray sample cards for color change and staining have five levels and nine levels according to the distinguishable color difference. Place the original textile sample and the post-test sample side by side on the same plane and close in the same direction, and the gray cards are also placed close to the same plane.

The background should be a neutral gray color, similar to the gray card between level 1 and 2 (approximately Mengsai color card N5). If you need to avoid the influence of the backing on the appearance of the textiles, you can take two or more layers of the original cloth under the original sample and the sample after the test. The northern hemisphere should be irradiated with northern light, the southern hemisphere should be irradiated with southern light, or 6001x and above Equivalent light source. The incident light is about 45 with the surface of the fabric.

Angle, the viewing direction is roughly perpendicular to the fabric surface. Use the grade difference of this gray card to visually assess the color difference between the original sample and the sample after the test. If a five-level gray card is used, when the color difference between the original sample and the sample after the test is equivalent to the color difference of the appearance of a certain level of the gray card, it is regarded as the fastness grade of the sample. When the color difference between the sample after the test and the original sample is in the middle of some two levels of the gray card, it can be set as the middle level, such as 4-5 or 2-3.

Only when there is no color difference between the sample after the test and the original sample, can it be rated as level five. If a gray card with five grades and nine grades is used, when a certain level of color difference is closest to the degree of color difference between the original sample and the sample after the test, it is regarded as the fastness grade of the sample.

Only when there is no color difference between the sample after the test and the original sample, can it be rated as level five. After grading a batch of samples, each pair of original and post-test samples rated at the same level shall be compared with each other. In this way, you can see whether the ratings are consistent, because any errors in the ratings will become prominent.

If the color difference of a pair is inconsistent with other pairs in the same group, the gray card should be re-evaluated and the original fastness level can be changed if necessary. Keqiao, Shaoxing, Zhejiang, has established a testing center with China Textile Standard, and they are experts in this regard. The address is at No. 315, Chuangyi Road, Jinkeqiao Avenue, I hope it is useful to you!