Chestnut (color) Chestnut (color) Chestnut is a colour, a medium reddish shade of brown (displayed right), and is named after the nut of the chestnut tree. An alternate name for the colour is badious. Indian red is a similar but separate and distinct colour from "chestnut". Chestnut is also a very dark tan that almost appears brown. The name "chestnut" derives from the color of the nut of the chestnut tree. The first recorded use of "chestnut" as a color term in English was in 1555. The color maroon is also named after the chestnut (via French "marron"). Deep chestnut is the
Color reaction Color reaction In chemistry, a color reaction or colour reaction is a chemical reaction that is used to transform colorless chemical compounds into colored derivatives which can be detected visually or with the aid of a colorimeter. The concentration of a colorless solution cannot normally be determined with a colorimeter. The addition of a color reagent leads to a color reaction and the absorbance of the colored product can then be measured with a colorimeter. A change in absorbance in the ultraviolet range cannot be detected by eye but can be measured by a suitably equipped colorimeter. A special colorimeter