A spectrophotometric method was used to study annealed nylon 6,6 in air at 150-180°C for periods ranging from 2 to 10 h. The spectral reflectance values were measured using the ACS600 colour control system of Applied Colour System, USA. The colour difference between annealed and unannealed samples of nylon 6,6 was given. Colour parameters, including luminance factor, dominant wavelength and purity were calculated. Relations between the optical data of spectrophotometric parameters are given for various annealing conditions. Also an empirical formula is given to illustrate the variations due to different colour parameters. These techniques are recommended to monitor oxidative degradation.
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