DIN EN 20105-A02 Color Fastness Tests of Textiles - Gray Scale for Evaluating Change in Color (ISO 105-A02)

In the DIN EN 20105-A02 standard, which is a European standard, gray scale properties and usage are explained to determine the changes in the color of textiles in color fastness tests.

Color fastness is the resistance of a material to color fading when exposed to environmental conditions. To ensure the quality of a material, it is necessary to test it against real-life conditions that it may encounter during its expected service life. The way to do this is to test the durability of the material against certain conditions, such as accelerated weather conditions. After the accelerated weathering testing program has been completed, physical and mechanical evaluations are required to detect any effects of the test. This is usually accomplished using a gray scale under a light.

Grayscale testing is the evaluation of color gradation differences in the appearance of a material. Grayscale is used to evaluate the change in color in the color fastness test when using light fastness standards as described in the DIN EN 20105-A02 standard and the ISO 105-A02 standard developed on the basis of this standard.

Known as the gray scale, the tool is basically based on grading 5 major and 4 intermediate steps and is used to visually evaluate and compare the color loss of a sample. The ranking consists of matches of gray swatches from 5 best to 1 weakest. Each match represents the shade difference between a tested sample and a control sample corresponding to a numbered rating.

A color fastness cabinet is used during the tests. This cabinet helps the observer determine the severity of surface changes of the exposed sample material using daylight or any other type of light such as fluorescent. The color difference between the two samples is measured against the sections on the gray scale and a corresponding grade is given.

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