Compositions: coating or plastic – Coating or plastic compositions – Metal-depositing composition or substrate-sensitizing...
Patent
1979-09-14
1980-12-23
McCarthy, Helen M.
Compositions: coating or plastic
Coating or plastic compositions
Metal-depositing composition or substrate-sensitizing...
156605, C04B 3544
Patent
active
042408342
ABSTRACT:
Disclosed is a synthetic single crystal for an alexandrite gem, which consists essentially of a synthetic chrysoberyl single crystal comprising aluminum oxide and beryllium oxide as the main components and chromium and vanadium as the coloring components, wherein vanadium is contained in an amount of about 0.00075 to about 2.95% by weight based on the crystal.
This single crystal shows a green or bluish green color under natural light and the color is changed to red or reddish violet when the single crystal is exposed to tungsten light the single crystal of the present invention is comparable or superior to natural alexandrite produced in the Ural Mountain Region with respect to the hue and color change characteristics.
REFERENCES:
patent: 1952255 (1934-03-01), Jaeger
patent: 3567643 (1971-03-01), Flanigen et al.
patent: 3723337 (1973-03-01), Yancey
patent: 3912521 (1975-10-01), Cline et al.
Machida Hisashi
Yoshihara Yoichiro
Kyoto Ceramic Co., Ltd.
Lubitz Stuart
McCarthy Helen M.
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