Colors are often related to passports and political geography. International Civil Aviation Organization (ICAO) only provides guidance on the size and format of passports, while the selection of designs and colors depending on each country. To date, four of the passport dominant color in the world are: green, red, blue and black.

Green

For some countries, the color related to religious issues. For example, Muslim countries such as Morocco, Pakistan and Saudi Arabia have adopted the color green as a passport because it is the favorite color of the Prophet Muhammad, the spiritual leader of the Muslim community, has always appeared to robe and green turban. It is also the color that appears on the flag of the Islamic countries such as Iran, Mauritania, Pakistan and Afghanistan. Some African countries such as Burkina Faso, Ivory Coast, Niger, Nigeria, Senegal ... green passport also represents member Economic Community of West African States (ECOWAS).

According to Hrant BOGHOSSIAN, Vice President Arton Group, the unit holding the passport data in the world, the red stands for the countries under Communism (including past or present), such as Slovenia, China Korea, Serbia, Latvia, Romania, Poland, Georgia. This is also colored some Nordic countries preferred, symbolizing Viking era. Passport Union block EU countries often act burgundy as "branding exercise". Thus, Turkey, Macedonia and Albania also change color to burgundy passport is hoping to join the EU.

Blue

Color is the national symbol of the New World (North America, South America, Oceania). Member States passport Caribbean Community (CARICOM) are blue to represent locations on the coast. Some South American countries (Brazil, Argentina, Paraguay, Uruguay and Venezuela) also blue passports represent their links with Mercosur customs union.

Black

Black passport number at least in 4 colors, belongs to African countries such as Chad, Democratic Republic of the Congo, Zambia, Botswana, Burundi, Gabon, Angola, Malawi; or in countries where black plays a key role as New Zealand. As for the US, the black passport holders they represent the diplomatic immunity, airport staff have no right ransacked, delay, arrest or detained them.

(Source: Hai Ha - VnExpress)