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In Okinawa some martial arts were practiced in secret, the belt had to be hidden or buried after training to prevent discovery by the authorities. They were rarely if ever washed and eventualy became black. The belt was also more of a loin cloth jigger like a sumo's thingy.
Or so the story goes, take it with a grain of salt.
Today they color code people so you know where to ask questions, and so you can know how authoratative the responses are.
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"It better be funny" 
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