黄金和足金都是黄色的贵金属，它们的区别在于它们的含金量不同。黄金是指含金量在99.9%及以上的金，是比较纯净的金；而足金则是指含金量在99%以下的金，通常会混合其他金属，比如银、铜等，以增加硬度或改变颜色。因此，足金的金纯度较低，价值也相对黄金要低一些。
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