This method is intended for determining the resistance of the colour of textiles of all kinds and in all forms to the action of sulphur dioxide as used for bleaching animal fibres.
A specimen of the textile, containing its own mass of soap solution, and a test-control specimen are exposed in an atmosphere containing sulphur dioxide. The change in colour of the specimen and the staining of the adjacent fabrics are assessed with the grey scales.
For more details click here:-
http://www.scribd.com/doc/27163926/BS-en-ISO-105-N05-1995-Textiles-Tests-for-Colour-Fastness
http://www.dfmg.com.tw/member/standard/bs/BS-N05.HTM
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