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A basic study for color identification of amethyst by spectrophotometer

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주제분류재료공학

초록

This study was carried out for the purpose of obtaining the basic data for color identification of amethyst by spectrophotometer. For this, the eleven amethyst stone and one citrine stone from eight countries were prepared in facet cut or plate. The transmittance and reflection of this samples were investigated as a function of wavelength. The transmittance or reflection was transformed to tristimulus value (X, Y, Z) and chromaticity value (x, y, z) and then compared with the results of eye observation which was plotted on CIE xyY color space. Finally, the influence of the amethyst's thickness on transmittance or reflection was investigated.

Abstract

This study was carried out for the purpose of obtaining the basic data for color identification of amethyst by spectrophotometer. For this, the eleven amethyst stone and one citrine stone from eight countries were prepared in facet cut or plate. The transmittance and reflection of this samples were investigated as a function of wavelength. The transmittance or reflection was transformed to tristimulus value (X, Y, Z) and chromaticity value (x, y, z) and then compared with the results of eye observation which was plotted on CIE xyY color space. Finally, the influence of the amethyst's thickness on transmittance or reflection was investigated.

참고문헌 (12)

  1. S.-N. Yoon, "Gem identification", Human Resources Development Service of Korea, 24 (2005)
  2. S.-N. Yoon, "A study on the characterization of amethyst using advanced analytical instrument", PhD, pp.2006
  3. H.Y. Lee, "Study on the formation of smoky color centers in γ-irradiated α-quartz by means of thermoluminescence", Journal of the Korean Physical Society, 1(1), pp.9~ (1968)
  4. K.J. Song, "Temperature dependence of the Fe 3+ - centers in natural amethyst", New Physics, 32(3), pp.442~ (1992)
  5. 박춘원, "수열처리법을 이용한 잠비아산 천연 자수정의 색상개선", 한국결정성장학회지, 14(2), pp.73~77 (2004), 한국결정성장학회
  6. L.B. Pasternak, "Growth and light-induced colour centres in crystals of yttrium aluminum garnet doped with Cr 3+ ions", Journal of Crystal Growth, 52(2), pp.546~ (1981)
  7. C.S. Han, "EPR study of the Fe 3+ -centers in natural amethyst occurring in Korea", PhD, pp.1986
  8. C.S. Han, "EPR study of iron centers in natural amethyst", Journal of the Korean Physical Society, 22(21), pp.241~ (1989)
  9. + center in α-quartz, "New Physics", 1992, 93~
  10. "Korean Standard Council, Standard illuminants and sources for colorimetry, Korean Standard KS A 0074, Korean Standard Association", ~ (1985)
  11. "Korean Standard Council, Methods of visual compaarison for surface colours, Korean Standard KS A 0065, Korean Standard Association", ~ (2005)
  12. "Korean Standard Council, Methods of measurement for colourof reflecting or transmitting objects, Korean Standard KS A 0066, Korean Standard Association", ~ (2006)

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