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History of the first karate blackbelts: In those days, it was often difficult to find fresh, clean water, so samurai usually had to wash their sashes in stagnant puddles. The longer one had been studying martial arts, the older the sash on one's karate uniform and, therefore, the darker the color. So why weren't their karate uniforms black too? Never seen a ninja????

Source: Kanji Koohii community