以染料弱酸深蓝5R和活性艳红X-3B染色的I-214杨素材和漂白板为试材,选用氙光作照射光源,考察不同染料、不同工艺条件下染色单板在110h光照过程中试材表面材色指数,即明度指数(L*),色度指数(a*与b*)和变色度(ΔE*ab)的变化。结果表明:染色单板在110h氙光照射过程中变色明显,b*值提高显著;ΔE*ab在光照初期大,后期平缓直到不变;同一品种染料,高浓度染液中染色单板比低浓度染液的光照变色大,浸染时间长短对染色单板光照变色影响不明显,先漂白再染色的单板材色均匀,光照变色平缓;不同品种染料的染色单板光照变色规律有差异。
The color change of veneers dyed by solution of Acid Blue 5R and Reactive Red X-3B after Xenon-lamp attenuation tests(110 h) is evident. During it had been being irradiated the color index (lightness L~*, the chromaticity coordinates a* and b*) had a large change, especial the change of b* is increasing rapidly, the change of the color difference (ΔE*ab) in the early period is far more than that in the middle and later period. The color change degree of veneers dyed by solution of higher concentration is larger than that of lower dye solution, the color change degree of bleached veneers dyed by solution is more than veneers dyed directly. The relation of the color change degree and dyeing time is not evident. It is difference that the law of color change veneers dyed by different dyes with Xenon-lamp attenuation.