This product is originally imported by James H. heal, also known as yellowing test paper. This supporting product is mainly used to test the phenol yellow degree of white or batik yarn, cloth and clothing during transportation or storage. Application scope this test is mainly aimed at phenol yellow caused by phenol. The reaction between nitrogen oxide and phenol yellow on the textile causes the textile to turn yellow. It can not directly detect the fading caused by other reasons
      such as: fading of brightener, oxidation of lubricant on fabric, etc. However, phenolic yellow test components have been proven to be effective in controlling the quality of white and batik products, significantly reducing customer complaints caused by phenolic yellow.
      
      It is widely used in Adidas ft-08 Courtauld test... Standard.