铑银闪银=基本金属快速镀铑
纯银往往是镀铑的抗蚀性。
“闪光镀金”,也就是当片镀一二十秒钟。
sterling silver is often rhodium-plated for tarnish resistance.
'Flash plated', which is when the piece is plated for ten or twenty seconds.
https://zh.wikipedia.org/wiki/%E9%93%91
就是银表面镀了一层铑,有白金的光泽,不容易氧化