This part of ISO 105 specifies a method intended for assessment of the potential to phenolic yellowing of textile materials.The method is specific to phenolic yellowing and does not cover the many other possible causes of yellow discolouration found on textile materials.NOTE: Use of the method does not guarantee that the materials tested will not exhibit yellowing in some form. It is intended as a screening test which, in practice, has been found to significantly reduce the number of complaints of phenolic yellowing by enabling corrective action to be taken with materials which, after testing, exhibit yellowing.