Three standard illuminations´ effect on jadeite-jade color green

The optimal illuminant of jadeite-jades´ color green were confirmed by the 277 pieces jadeite-jades´ analysis of L*, C* and □E* ₂₀₀₀ under 3 standard illuminants D₆₅, CWF, and AError! Reference source not found. By the contrastive analysis of theoretical and tested spectral distribution between standard illuminant CWF and D₆₅, A, it is revealed that D₆₅ has continuous and smooth spectral distribution with high color temperature, combined with the testified little effects on jadeite-jades´ lightness from illuminants changing by ANOVA, D₆₅ is the illuminant which benefits for C* and L* of jadeite-jades´ color green most. Color difference analysis shows that co mpared with other two illuminants, the average □E*2000 is the biggest and sample variance is the smallest under illuminant CWF. It is concluded that the standard illuminant D₆₅ and CWF are the best illumination source and evaluating source of jadeite jade color green respectively.