Grey scale

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A series of pairs of neutrally coloured chips, showing increasing contrast within pairs, used visually to assess contrasts between other pairs of patterns: for example the ISO (International Organization for Standardization) Grey Scales comprise two series of chips against which the magnitude of the change in colour of a specimen submitted to a fastness test and of staining of adjacent uncoloured material can be visually assessed and rated on a 1-5 scale

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