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See Chinese contents: GB/T 251-2008 GB/T 251-2008: Textiles -- Tests for colour fastness -- Grey scale for assessing staining
This Standard specifies the grey scale and its use method for assessing the degree of staining of the lining fabric in the tests for color fastness of textiles. This Standard provides an accurate color measurement interval of grey scale, which may be used as the permanent record for the comparison of the newly produced grey scale and the grey scale that may change.
