[Answer] Which is NOT one of the four colors used for passport covers worldwide?

Step 1 : Introduction to the question "Which is NOT one of the four colors used for passport covers worldwide?"

...1. Red 2. Blue 3. Green 4. White

Step 2 : Answer to the question "Which is NOT one of the four colors used for passport covers worldwide?"

White - The next time you’re standing in line at customs, take a look at the passports and you may notice a theme. Passports around the world are only made in four shades: red, blue, green, and black. While there aren’t any official rules around color, the reason for the limited variety is because these simple, dark hues make the documents look more official. Blue is the most common choice, followed by red, green, and, black. Malawi and New Zealand are among the just seven countries with black covers. The color used is often symbolic: Many Islamic states have green passports due to its religious significance. And colors don’t always stay the same: Before the switch to blue in 1976, American passports were green.:

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