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See Chinese contents: GB 251-1995 GB 251-1995: Gray scale for assessing staining
This standard specifies the gray scale for assessing the staining of textiles, in the color fastness test of textiles, as well as its application method. The precise color measurement interval value of this gray scale can be used, as a permanent record, for the comparison of newly produced gray scales AND the gray scales that have changed during storage or use.
