Fawn (colour) use the term "fawn" to describe a red dog (at the Eumelanin locus) that carries a copy of the dilution gene; in Dobermans this color is more commonly called "Isabella". 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
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