Why are passport colours different?

Answer 1

The Official Status of the individual is designated by the color of the passport's cover: * A blue passport indicates that the individual is an ordinary citizen. * A green passport is the same status, prepared as a State Department design to recognize its 200th Anniversary. * A maroon or red passport indicates that the individual is on official US Government business, Not of a diplomatic nature. That individual may be US Military, the family of US military, an agency such as a trade mission, a file clerk, receptionist or other functionary. Those bearing this passport are to be afforded such assistance as they may require, but they do Not have Diplomatic immunity. * A black cover declares to all customs and Immigration officials that the bearer is a Diplomat or on a Diplomatic Mission for his Government, and that he or she has Diplomatic Immunity from search of his person or property at all times, from arrest, detention or delay of any kind or on any charge. Black is Beautiful.