| 摘要 |
<p>A golden ornament material hardened by alloying pure gold having a purity of 99 % or above with 200-2000 ppm of one or more elements selected from Ca, Be, Ge and B, and, when necessary, 10-500 ppm of one or more elements selected from Mg, Al, Si, Mn, Fe, Co, Ni, Cu, Pd, Ag, In, Sn, Sb, Pb and Bi and/or 10-1000 ppm of one or more rare earth elements including Y based on the total quantity of the resultant mixture.</p> |
