Blue

It may seem like a basic color, but blue is actually rather rare in the natural world. That complicates the search for natural blue food colorings, but now a team of scientists has found a promising candidate hiding in red cabbage.

For a few years scientists have predicted a fifth kind of phosphorus should be possible, but it had yet to be confirmed. Now, researchers in Germany have managed to show that blue phosphorus does exist, and mapped out its different properties.