Colorfastness to atmosperic Oxides of nitrogen

This part of ISO 105 specifies a method for determining the resistance of the colour of textiles to the action of oxides of nitrogen in the atmosphere at elevated temperatures and high relative humidities.

A test specimen and a piece 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 øC 1 øC 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.
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Colorfastness to nitrogen oxides

This method is intended for determining the resistance of the colour of textiles of all kinds and in all forms to the action of nitrogen oxides produced during combustion of gas, coal, oil, etc., and when air is passed over heated filaments.
Two tests differing in severity are provided;

one or both of them may be used depending on the requirement.

Specimens of textiles are exposed to nitrogen oxides, In a closed container until either one or three test-control specimens exposed simultaneously with the test specimens have changed in colour to a predetermined extent. The change in colour of the specimen is assessed with the grey scale.

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