• In Iran, blue is the colour of mourning.

• Blue was used as protection against witches, who supposedly dislike the colour.

• If you are “true blue”, you are loyal and faithful.

• A room painted blue is said to be relaxing.

• Something “out of the blue” is from an unknown source at an unexpected time.

• A blue blood is a person of noble descent. This is probably from the blue veins of the fair-complexioned aristocrats who first used this term.

• “Into the blue” means into the unknown.

• The pharaohs of ancient Egypt wore blue for protection against evil.

• The “blue” is a style of music derived from southern African-American secular songs. It influenced the development of rock, R&B, and country music.

• Blue stands for love, which is why a bride carries or wears something blue on her wedding day.

• In ancient Rome, public servants wore blue. Today, police and other public servants wear blue.