The second specimen shall be subjected to a source of illumination in accordance with ISO Standard 105 - B02 - 1978, Section 4.3.1; the retro-reflective material shall be exposed until blue standard No 7 has faded to No 4 on the grey scale.
Teist näidist katsetatakse ISO standardi 105-B02-1978 jaotise 4.3.1 kohaselt valgustades; valgustpeegeldavat materjali katsetatakse, kuni sinise standard nr 7 on tuhmunud hallskaala järgi numbriks 4.