The effect of various amounts (0.5-1.2 owf) of two benzotriazole (Tinuvin P and Tinuvin 320) and one benzophenone (Ultrafast 800) type UV-absorbers applied directly in the dyeing of polyester fibres with CI Disperse Yellow 42 at various depths (0.5, 1.0 and 2.0% owf), or by after-treatment of the dyed fibre, was studied. Combinations of Tinuvin 320 with various amounts of an antioxidant (BHT) in the dye liquor were also used and results compared.