| Abstract: | Fabrics dyed with single dyes have been faded in daylight, the exposure being measured in langleys. The spectral reflectance data before and after exposure have been used, in the Kubelka-Munk function, to calculate the reflectances of the unfaded and faded dyeings. The colour difference ΔE is a measure of the fade. By exposing the BSI blue wool standards alongside the dyes, the colour difference can be converted to blue-scale assessments. The predicted assessments agree with visual assessments within one-half a blue standard. |
