| 摘要 |
PURPOSE:To easily obtain head emitting rainbow color by repeating a process wherein an organic metallic soln. forming oxide different in refractive index by heating is coated on glass powdery grain and heated. CONSTITUTION:In a method for obtaining a glass bead by heating powdery grain obtained by crushing of glass and rounding its corner, a process wherein an organic metallic soln. forming oxide by heating is coated on the powdery grain and heated is repeated in plural times for oxide different is refractive index by heating. In such a way, interference of light is caused and brighter rainbow is obtained by laminating an oxide layer different in refractive index in two layers or above. Interference of light is easily caused and brighter rainbow color can be realized by regulating the oxide film thickness of each layer to 400-1,500Angstrom .
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