Colorfastness to ozone in the atmosphere

This method is intended for determining the resistance of the colour of all kinds of textiles to the action of ozone in the atmosphere both at ambient room temperatures with relative humidities not exceeding 65 % and at elevated temperatures with relative humidities above 80 %.

A specimen and a swatch of control sample are simultaneously exposed to ozone in an atmosphere at ambient room temperatures and relative humidities not exceeding 65 %, until the control sample shows a colour change corresponding to that of a standard of fading. This exposure period constitutes one cycle. The cycles are repeated until the specimen shows a definite colour change or for a prescribed number of cycles.
A specimen and a swatch of control sample are simultaneously exposed to ozone in an atmosphere which is maintained at 85 ± 5 % relative humidity and a temperature of 40 ± 5 oC until the control sample shows a colour change corresponding to that of a standard of fading. The cycles are repeated until the specimen shows a definite colour change or for a prescribed number of cycles.
The fading of dyes on certain fibres does not readily take place at humidities below 80 %. A test at high humidities is required to produce colour change that predicts service fading under warm, humid conditions.
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AATCC 109-2005 Colorfastness to Ozone in the Atmosphere under Low Humidities

http://www.dfmg.com.tw/member/standard/bs/BS-g03.HTM