Everyone knows that red means danger, but how did purple become a cautionary color? At an EPA conference in the late 1990s, attendees nearly came to blows over color coding on the Air Quality Index.

“Purple has the excitement of red, but the calmingness of blue,” she says, noting that while orange is also a secondary color, its red and yellow components share warm messaging. Fair.

The color purple has long been a symbol of royalty, creativity, and mystery. ... While it looks just as real as red or blue, purple is actually an optical illusion crafted by your brain.

Purple, a color often associated with royalty and creativity, isn't a true color of light. Instead, it's a creation of our brain when it perceives a combination of red and blue light.

The Diamondbacks began wearing the new uniforms with Sedona Red as the main color at the start of the 2007 season, after wearing variations of the purple uniforms with teal, black and copper trim ...

Blue and purple auroras tend to be visible toward the lower parts of the display. Yellow and pink aurora. ... These colors result from a mixture of red auroras with green or blue auroras.

Uluru, a World Heritage site in northern Australia, is renowned for its color-changing ability due to its sandstone composition. The rock shifts colors from red, purple to orange based on the sun ...