| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a novel seal material having excellent nature as a high-grade seal using a metal material as a material, in place of the seal of a natural material gradually being difficult to be obtained, and having massiveness, luxury, glue of a vermilion ink-pad, and durability. Ž<P>SOLUTION: At least a surface 4 around an aluminum alloy seal includes an alumite layer 5 subjected to alumite processing. More preferably, coloring processing where coloring materials are poured into very small holes of the alumite layer 5 is performed. Then, the alumite layer is sealed, and thus the coloring materials of the colored layer 6 are hardly peeled off. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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