Light-conditioning
2.7.3.2.1. The provisions of Recommendation ISO/R 105 - 1959, "Test for colour fastness of textiles", as amended by Addendum I (ISO/R 105 - 1959/A1 - 1963) and Addendum II (ISO/R 105/II
- 1963) shall apply. The strap shall be exposed to light for the time necessary to produce fading of Standard Blue Dye no 7 to a contrast equal to grade four on the grey scale.
2.7.3.2.2. After exposure, the strap shall be kept for a minimum of 24 hours in an atmosphere having a temperature of 20 more or less 5 C and a relative humidity of 65 more or less 5 %. The breaking load shall be determined within five minutes of the sample's removal from the conditioning installation.
