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Why do most passports come in just four colours?

Thread starter United Kingdom International Civil Aviation
Start date Yesterday at 7:39 PM

Yesterday at 7:39 PM

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… , the International Civil Aviation Organisation (ICAO), which sets global standards for … a passport cover. According to ICAO officials, the choice of colour … and parts of Europe. The UK famously switched back to blue …

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Why do most passports come in just four colours?

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