时差N小时 黄金是黄色的吗?(下)（在线收听）

If most gold jewelry is an alloy, why is some white and some yellow?

如果大多数黄金首饰是合金的话，为什么有的是白色有的是黄色呢？

The final appearance depends on the type of alloy metal used.

珠宝外观最终取决于所使用合金金属类型。

Alloys made with white metals like silver, palladium and nickel create white-colored gold.

用银、钯和镍等白色金属制成的合金为白色的黄金。

Adding some copper to the alloy will restore the yellow color, but too much copper can turn the gold reddish.

在合金中加入铜可以恢复为黄色，但是铜过量会导致黄金变红。

The color of gold jewelry doesn’t reveal how much gold is in it — a piece of white gold may have the same number of carats as a piece of yellow gold.

黄金首饰的颜色并不能看出其含金量。一块白金的含金量可能与一块黄金的含金量相同。

But, it has a different alloy metal, and so it has a different color.

由于黄金里掺有不同的合金金属，因此黄金会呈现出不同的颜色。

Unlike white gold, fool’s gold has no gold in it at all. It’s a mineral called iron pyrite.

与白金不同，愚人金根本不含任何黄金。它其实是一种叫做黄铁矿的物质。

Black gold isn’t gold either, it’s oil. Which is also valuable, but doesn’t look as good on your fiancee’s finger.

黑金也不是黄金，而是石油。黑金同样很值钱，但是戴在未婚妻手上可不那么美观。