GB/T 251-2008 Translated English of Chinese Standard. (GBT 251-2008, GB/T251-2008, GBT251-2008): Textiles - Tests for Color Fastness - Grey Scale for Assessing Staining [Buy--download True-PDF in 3-second: https://play.google.com/books > Sign in > This BOOK > "3-dots" > Export > Save as "*.pdf"]

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.