The passports of 193 different UN member countries are basically of four primary colors. Shades may vary but the base remains one of red, blue, green or black.
Red is the most common passport color across the globe. It is common amongst the member nations of the European Union (EU).
The red cover is argued to be chosen by a country because of its past communist history or a present communist system.
From America to India, many countries prefer a blue cover for their national passport.
The blue color symbolises the New World and thus the countries that support the New World use a blue passport.
Green colored passports are common for Islamic countries. These include Pakistan, Saudi Arabia and Morocco.
Green is believed to be the favorite color of Prophet Muhammad (PBUH) and is also considered to be a symbol of nature and peace.
The rarest passports are the ones with a black cover. Not many countries prefer a black color because of different reasons.
The countries that do use black passports include a few African nations like Zambia, Congo, Chad, Malawi and others. New Zealand uses black passports as it is the country’s national color.
Indian Government issues passports in three different colors;
Blue for regular passport
White for official passport
Maroon for a diplomatic passport
In Turkey, a green passport is issued to people who are allowed to travel visa free to a few countries.