On Election Night 1976, TV maps had the GOP in blue, Democrats in red. The same color scheme prevailed in 1980 when Ronald Reagan turned most of the map blue before the West Coast got home for supper.
After Crayola announced it was retiring the yellow crayon Dandelion, the company said its replacement would be blue, but would it be a true blue? No, it's actually an accidental blue.
In 2009, a chemist and his students stumbled across a blue pigment that had never before been seen. Now that it's been licensed for commercial use, you may start seeing it everywhere.