The first US passports were simple pieces of paper. Times have changed, and today’s passports rely on cutting-edge technology to protect against forgery. ¬†While most of that technology is top-secret, here are four elements that distinguish a real passport from a fake.

Ink: More than Meets the Eye

Put your passport under a black light and prepare to be amazed, as special fluorescent ink creates glowing patterns across the pages.

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