Why Do Passports Only Come in Four Colors ?
Passports are only made in shades of blue, red, green, and black.
is this because of regulations?
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sources:
http://www.dailymail.co.uk/travel/tra...
https://www.rd.com/advice/travel/why-...
http://mentalfloss.com/article/518685...
http://www.independent.co.uk/travel/w...
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