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Grey is not used in belt colors for judo rankings.
Grey is not a color of judo . White and blue colored gi(dress),and belt color may different .
There is Blue Gi's and Blue belt ( 6th belt )
Black, the rank is called Shodan.
The belt in karate is called an obi. The color scheme for promotions is based on the judo system developed in Japan. The belts provide a visible means for an instructor to tell what level the student is at and what they are learning.
bluegrey... (If that is even a color)
it comes from japan
Judo originated from Japan
The belt order goes as follows: White (Single Wide) Yellow Orange Green Blue Purple Brown Black (1-5th Dan) Red and White (6th-8th Dan, Most Still Wear Black.) Solid Red (9-10th Dan) Double Wide White Belt (12th Dan, has never been awarded. Perfection has to be attained before receiving this belt, and perfection is not possible. The Kodokan, and other judo organizations have the power to award this but never have.)
It is judo
No, judo is not from China. Judo was created in Japan. It was developed based on Jujitsu.
Japan