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See Chinese contents: GB/T 40920-2021 GB/T 40920-2021: Leather -- Tests for colour fastness -- Colour fastness to cycles of to-and-fro rubbing
This Standard specifies the test method that uses felts to do cycles of to-and-fro rubbing on the leather surface, so as to determine the color fastness to rubbing on leather surfaces. This Standard applies to the test of color fastness to cycles of to-and-fro rubbing on various types of leather surfaces.
