This product is originally imported from James h.heal, UK, also known as phenol yellow yellowing test film. It does not contain BHT. It is used to wrap test samples during testing. This supporting product is mainly used to test the phenol yellow degree of white or batik yarn, cloth and clothing during transportation or storage. Scope of application this test is mainly aimed at phenol yellow caused by phenol. The reaction between nitric oxide on textiles and phenol of phenol yellow causes textiles to turn yellow. It does not directly detect discoloration caused by other causes Such as fading of brightener, oxidation of lubricant on fabric, etc. However, the phenol yellow test kit has been proven to effectively control the quality of white and batik products, significantly reducing customer complaints caused by phenol yellow. ⏹ In Adidas ft-08 Courtauld test It is widely used in the standard.