Rank in Judo applied to juniors below the age of 15 due to safety reasons. In Israel the following belt colors exist: Brazilian belt rankings are normally white, blue, yellow, orange, green, purple, brown and black (6th, 7th, and 8th dan may wear alternating red and white panels, and 9th and 10th dan holders may wear solid red belts). Additionally, a grey belt may be given to very young judoka (under 11 or 13 years old) just before the blue. Sometimes, competitors are organized into two categories depending on grading; the first is from white to green, and the second is purple through
Gardner color scale Gardner color scale Gardner Color Scale is a one-dimensional scale to measure the shade of the color yellow. Colors of transparent liquids have been studied visually since the early 19th century. Changes in color can indicate contamination or impurities in the raw materials, process variations, or degradation of products over time. One dimensional scales for yellowness were created, e.g., Gardner Color Scale. The yellowness of the transparent liquid is determined by pouring the sample into a tube and comparing it to a pre determined and known standard. The standard that the sample falls closest to then becomes the value for