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.

The expanded spectrum of wine is an effort to have it both ways, to preserve the complexities while trying to simplify the process of choosing a bottle. Yes, we’ve gotten to a time where “red ...

During a hue test, individuals have to arrange colors on a spectrum from red to purple. If an individual cannot work out the right order, it may point to color blindness.