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The chemical composition and influencing factors of the colour of 95 yellow to light blue iron-bearing beryl are studied through Electron Microprobe Analysis (EMPA), Energy-dispersive X-ray fluorescence (ED-XRF) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, ultraviolet–visible (UV–vis) spectroscopy and X-Rite SP62 spectrophotometer. The larger the area of the band at 545 nm, the lower the lightness and the higher the hue angle, which means the ruby colour is redder. In the ultraviolet–visible light spectrum, the strong absorption band of Cr3+ at 545 nm is the main cause of the color of the ruby. As the length of the light path continues to increase, the influence of the standard light source on the color difference ΔE*ab decreases. The color difference ΔE*ab reaches the maximum when the light path length is around 10 mm, and the standard light source has the greatest influence on the color difference ΔE*ab. The chroma C* first increases as the length of the light path increases, and then begins to decrease under the influence of the continuous decrease in lightness. At the same time, as the length of the light path increases, the lightness L* decreases, and the hue angle h° increases. The results show that the difference in colour between the o light direction and the e light direction of the synthetic ruby decreases as the length of the light path increases. The corrected ultraviolet–visible light spectrum was used to calculate the color of synthetic rubies with different light path lengths, and the influence of light path length and standard light source on the color of synthetic ruby was studied. As the length of the light path continues to increase, the influence of the standard light source on the color difference\(\)ΔE * ab decreases. The color difference ΔE * ab reaches the maximum when the light path length is around 10mm, and the standard light source has the greatest influence on the color difference ΔE * ab. The chroma C * first increases as the length of the light path increases, and then begins to decrease under the influence of the continuous decrease in lightness.
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As the length of the light path increases, the absorption peak area at 545nm also increases, the lightness L * decreases, and the hue angle h° increases. In the ultraviolet-visible light spectrum, the strong absorption band of Cr ³⁺ at 545nm is the main cause of the color of the ruby. The results show that the L *, C *, h° under the A light source are higher than those under the D65 light source. The corrected ultraviolet-visible light spectrum was used to calculate the color of flame-fusion synthetic ruby, and the influence of light path length and standard light source on the color of flame-fusion synthetic ruby was studied. Colorimetric studies of different light path lengths from a new perspective of UV-Vis spectroscopy.
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