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ISO 105-G04:1989 Textiles -- Tests for colour fastness -- Part G04: Colour fastness to oxides of nitrogen in the atmosphere at high humidities
standard by International Organization for Standardization, 12/01/1989
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A test specimen and a apiece of control fabric are simultaneously exposed to oxides of nitrogen in an atmosphere which is maintained at 87.5 % 2.5 % relative humidity and at temperature of 40 C 1 C until the control fabric shows a colour change corresponding to that of a reference of fading. The exposure/measurement cycle is repeated until the specimen shows a definite colour change or for a prescribed number of cycles.