A midnight blue belt is a belt worn in some Korean martial arts to signify that the wearer has attained dan rank, which translates to a degree holder.
Its origin lies in Hwang Kee, who used it to denote dan holders in the Soo Bahk Do Moo Duk Kwan.
[1] In tang soo do, black is viewed as a colour that does not become darker, and thus signifies an end (death), whereas midnight blue represents more positive concepts, such as the element of water.
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