Fawn (colour) Fawn (colour) Fawn is a light yellowish tan color. It is usually used in reference to clothing, soft furnishings and bedding, as well as to a dog's coat color. It occurs in varying shades, ranging between pale tan to pale fawn to dark deer-red. The first recorded use of "fawn" as a colour name in English was in 1789. The fawn coat color is found in many breeds, such as Boxers, Great Danes, and Pugs. Genetically, in most cases the color is due to the recessive a gene at the Agouti locus. Some breeds, such as Chows and Doberman Pinschers
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