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The flag of Qatar was officially adopted in 1949.
The story goes that Qatar's original flag used an unstable red dye, and the relentless sun faded that red into a shade of maroon, and that color is referred to today as Qatar Maroon. The toothy edge between the maroon and white fields, and the flag's width, helps to identify it from that of Bahrain's flag, a Gulf State's country that it was formerly associated with.
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