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Phenolic yellowing affects natural and synthetic fibers. The phenolic antioxidants present in the packing material along with exposure to oxides of nitrogen and alkali pH of the fabric are responsible for yellowing. The Phenotest assesses the potential of phenolic yellowing of textile materials. Performing this test will
help manufacturers understand and predict if a fabric will yellow while in its package, in transit and in storage. Phenolic yellowing is a discoloration phenomenon in textiles caused by the reaction of nitrogen oxides with yellowable phenolic compounds, often resulting in unsightly yellow stains on white or light-colored
fabrics. The Phenotest Control Fabric is used to confirm the phenotest has been conducted properly because the control fabric has been tested and is a known fabric susceptible to yellowing under the conditions of the test. The test is considered valid if the phenotest control fabric has turned yellow.