Cr3+ Effect on the Correlation between Lightness Difference and Color Difference of Ruby Red
| Periodical | Advanced Materials Research (Volume 177) |
|---|---|
| Main Theme | Testing and Evaluation of Inorganic Materials I |
| Edited by | Yiwang Bao, Li Tian and Jianghong Gong |
| Pages | 624-627 |
| DOI | 10.4028/www.scientific.net/AMR.177.624 |
| Citation | Ying Guo et al., 2010, Advanced Materials Research, 177, 624 |
| Online since | December, 2010 |
| Authors | Ying Guo, Xiang Li, Li Tian |
| Keywords | Color Difference, Color Evaluation, Cr3+, Ruby |
| Price | US$ 28,- |
The correlations between of lightness, chroma, Cr3+ and color index were studied to analyze the impact of all these three elements on ruby red color; and with the color difference research, the lightness difference is testified to be the key affecting color appearance. Based on the uniform color space CIE 1976L*a*b*, the ruby displays the best red color when the content of Cr3+ is within (1555, 5183ppm), L* (32.64, 44.25) and ho (354.14, 0.7). With the help of partial correlation analysis of color difference, it is illustrated that the correlation between L* and E* (r=0.999) is relatively higher than that between L* and E* (r=0.948); and with high significance level ( = 0.129) of H* and E*, it shows that H* has little impact on E*. It is concluded that the color change of ruby from red to purple are mostly affected by lightness change; lightness difference should be considered as the most important factor when evaluating the red color of ruby, and then followed by the chroma and hue jointly.
