This part of ISO 105 describesThe grey scale for determining changes in colour of textiles in colour fastness tests, and its use. A precise colorimetric specification of the scale is given as a permanent record against which newly prepared working standards and standards that may have changed can be compared.
EN 20105-A02:1994 history
1994EN 20105-A02:1994 Textiles - Tests for colour fastness - Part A02: Grey scale for assessing change in colour (ISO 105-A02:1993)
1992EN 20105-A02:1992 Textiles; tests for colour fastness; part A02: greyscale for assessing change in colour (ISO 105-A02:1987)