This part of ISO 105 specifies a method For measuring the colour difference between two specimens of textile in any form. The existence of a master reference is necessary when the test is carried out by comparing the master reference with the test specimen The method is applicable to coloured specimens.
This part of ISO 105 selects from the several options published by the International Commission on Illumination (CIE) those best suited to the needs of the textile industry whenever the difference in colour between two specimens has to be quantified.
For more detail click here:-http://www.dfmg.com.tw/member/standard/bs/BS-j01.HTM
Instrumental assesment of relative whiteness ISO 105 BS J02
Calculation of color difference between two samples ISO 105 BS J03 1997