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ISO 105-N04:1993 Textiles -- Tests for colour fastness -- Part N04: Colour fastness to bleaching: Sodium chlorite (severe)
standard by International Organization for Standardization, 10/01/1993
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Specifies a method for determining the resistance of the colour of natural cellulose textiles to the action of severe bleaching with sodium chlorite as ordinarily employed in textile processing. A specimen in contact with one or two specified adjacent fabrics is treated in a sodium chlorite solution, rinsed and dried. The change in colour of the specimen and the staining of the adjacent fabric(s) are assessed with the grey scale.