Blue skies were smiling and bluebirds were singing for Irving Berlin, but blue is actually nature's rarest color. Blue flowers are less than 10% of the world's 300,000 flowering plant species.

Ultramarine blue floods the shawl of Vermeer’s “Girl With the Red Hat.” It glistens above the soft face of the “Girl With a Pearl Earring.” ...

Understanding the process by which ultramarine blue fades will allow further research to identify proper art conservation techniques. "Apart from the scientific interest in this work, ...

Synthetic ultramarine and a new “Monastral Blue,” another deep shade, began to be industrially produced. Blue of all kinds was no longer only for kings and Christ. Blue can be found from Monet’s plein ...

We also get a look at an “Ultramarine Blue” color option (seen above), in addition to previously reported Onyx Black and Glacial Green options. Check out the images below, courtesy of Quandt ...

Both ultramarine blue and the rooster are symbols of France, whose defeat by Britain at the battle of Trafalgar in 1805 gave the square its name.

New leaks for the OnePlus 8 Pro reveal the phone might come in a deep blue color called “ultramarine blue,” reports WinFuture. The phone may also come in “onyx black” and “glacial green.” ...