BS EN 20105-A03:1993 Textiles. Tests for colour fastness -Part A03. Grey scale for assessing staining
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This part of ISO 105 describes the grey scale for determining staining of adjacent fabrics 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, or 5-step, scale consists of five pairs of non-glossy grey or white colour chips (or swatches of grey or white cloth), which illustrate the perceived colour differences fastness ratings 5, 4, 3, 2 and 1. This essential corresponding scale may be augmented by the provision of similar chips or swatches illustrating the perceived colour differences cor- responding to the half-step fastness ratings 4-5, 3-4, 2-3 and 1-2, such scales being termed 9-step scales. The first member of each pair is white in colour and the second membe of the pair illustrating fastness rating 5 is identical with the first member. The second members of the remaining pairs are increasingly darker in colour so that each pair illustrates increasing contrasts or perceived colour differences which are defined colorimetrically. The full colorimetric specification is given below.
The chips or swatches shall be white or neutral grey in colour and shall be measured with a spectrophotometer with the specular component included. The colorimetric data shall be calculated using CIE 1964 supplementary standard color-imetric system (10° observer data) for illuminant D65.
2.3 The Y tristimulus value of the first member (white) of each pair shall be not less than 85.
