The more unusual hues, such as olive, mint or sea green, are generally ... Fire opals are translucent and contain shades of ...

While he perceived it as green, his wife saw it as blue. This disagreement led to the creation of his new website ismy.blue, ...

If you’ve ever argued with a friend over whether something is blue or green, you’re not alone. A new test called “Is my blue your blue?” reveals how different — or similar — your color ...

So it is no surprise to see a little online test go viral based on the very arbitrary demarcation between blue and green. Sure, navy and forest are very different shades. So are emerald and sapphire.

But what if our oceans weren’t always blue? According to recent research, Earth may have had green oceans for billions of years before they finally took on their familiar blue hue. Scientists ...