The color "beaver" was formulated as one of the Crayola colors in 1998. Etymologically, it's believed that the words "brown" and "beaver" ultimately stem from the same root word. Beige is a light tan color representative of the color of unbleached wool. Buff is a pale yellow-brown color that got its name from the color of buffed leather. According to the Oxford English Dictionary, buff as a descriptor of a color was first used in the "London Gazette" of 1686, describing a uniform to be "A Red Coat with a Buff-colour'd lining". Burnt umber is made by heating raw umber, which dehydrates the iron oxides and changes them partially to the more reddish hematite. It is used for both oil and water color paint. The first recorded use of "burnt umber" as a color name in English was in 1650. Displayed at right is the color chestnut. Displayed at right is the color chocolate. The Reserve Bank of India (RBI) issued a Chocolate Brown colored banknote of ₹10 denomination in January 2018 under Mahatma Gandhi New Series. The bank note measures 123 mm × 63 mm.  Displayed at right is the color cocoa brown. Dark brown is a dark tone of color brown. The color desert sand is displayed at right. It may be regarded as a deep shade of beige. It is a pale tint of a color called "desert". The color name "desert" was first used in 1920. Displayed at right is the color khaki. This is the web color called "khaki" in HTML/CSS. The color shown at right matches the color designated as "khaki" in the 1930 book "A Dictionary of Color", the standard for color nomenclature before the introduction of computers. The first recorded use of "khaki" as a color name in English was in 1848. The color kobicha (brown-nose) is displayed at right. It is one of the Japanese traditional colors that has been in use since 660 AD in the form of various dyes used in designing kimonos. The name "kobicha" comes from the Japanese for the color of a type of kelp tea, but the word was often used as a synonym for a form of flattery in a curious parallel with the English usage "brown nosing". Displayed at right is the web color Peru.