EN ISO 20105-A02 Textiles, Color Fastness Tests, Part A02: Gray Scale for Evaluating Change in Color

Material Testing

EN ISO 20105-A02 Textiles, Color Fastness Tests, Part A02: Gray Scale for Evaluating Change in Color

EUROLAB laboratory provides testing and compliance services within the scope of EN ISO 20105-A02 standard. Explains the gray scale and its use to determine changes in the color of textiles in color fastness tests.

EN ISO 20105-A02 Textiles, Color Fastness Tests, Part A02: Gray Scale for Evaluating Change in Color

A precise colorimetric characteristic of the balance is given as a permanent record against which newly established working standards and standards that may have changed can be compared. The basic scale consists of non-glossy gray color chips (or gray fabric swatches).

The basic, or 5-stage scale, consists of five pairs of non-glossy gray color chips (or gray fabric swatches) showing perceived color differences corresponding to fastness grades 5, 4, 3, 2, and 1. The scale can be increased by providing similar chips or color samples showing the perceived color differences corresponding to 4-5, 3-4, 2-3 and 2-XNUMX half-step fastnesses, such scales are called g-step scales.

The first element of each pair is neutral gray, and the second element of the pair is the same as the first element, showing a fastness rating of 5. The second members of the remaining pairs are increasingly lighter in color, so that each pair shows increasing contrasts or perceived color differences, defined calorimetrically.

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