PURPOSE: To impart color development variable to multiple colors to a metallic surface without using noble metals by forming a thin film consisting of the reaction product of gaseous components by a heat treatment on the surface of a metallic material provided with fine ruggedness corresponding to interference fringes of a laser beam.
CONSTITUTION: The surface of the metallic material M, for example, stainless steel, Ni-Cr alloy, Ti or alloy essentially consisting of Ti, is irradiated with the laser beam L to cause interference on its surface, by which the fine ruggedness G corresponding to the interference fringes is formed. The surface having this fine ruggedness G is thereafter heat-treated in a reactive gas, for example, oxygen-contg. atmosphere or nitrogen atmosphere, by which the thin film P consisting of the reaction product of the metallic component and the above- mentioned gaseous component is formed. The ornaments with which patternssuch as pictures and characters. are visibly observed as reflected gloss of beautiful rainbow color development on the surface color different from the ground color as a background are obtd.
NAKANISHI TAKASHI
OSHIMA ICHIRO
OSHIMA TOKIHIKO
HIRATA SHIGEKAZU
OKANO YOSHIKAZU
OFIC CO
| JPH0285349A | 1990-03-26 | |||
| JPH0285350A | 1990-03-26 | |||
| JPH0491874A | 1992-03-25 | |||
| JPH02263589A | 1990-10-26 | |||
| JPH0441662A | 1992-02-12 |
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