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ISO 105-A02:1993 Textiles -- Tests for colour fastness -- Part A02: Grey scale for assessing change in colour
standard by International Organization for Standardization, 09/01/1993
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Full Description
Describes the 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. The essential scale (5 steps) consists of pairs of non-glossy grey colour chips (or swatches of grey cloth). In addition, an augmented scale includes four half-steps and, thus, 9 steps.