In general, passports are only red, green, blue, or black, according to Hrant Boghossian, the vice president of marketing at the financial advisory firm Arton Capital, which runs the interactive ...

Passports around the world predominantly come in shades of blue, red, green, or black. There is a good reason for this ...

For example, Islamic countries often use green passport covers because the color is important in their religion. Member countries of ECOWAS (the Economic Community of West African States ...