If gold and silver were mixed together, what colour metal would you end up with?
The naturally occurring alloy of gold and silver is commonly known as electrum. Its colour depends on the ratio of gold and silver in the mix: a whitish alloy appears below 50 per cent gold, turning to greenish yellow as the amount of gold increases, and bright yellow at around 85 per cent gold. To get a wider range of colours, metallurgists and jewellers may add in a third metal. Introducing copper, for example, leads to reddy yellows and deeper brassy reds.