Eye color for a plausible argument stating that some eyes can or do change, based on chemical reactions and hormonal changes within the body. Studies on Caucasian twins, both fraternal and identical, have shown that eye color over time can be subject to change, and major demelanization of the iris may also be genetically determined. Most eye-color changes have been observed or reported in the Caucasian population with hazel and amber eyes. Carleton Coon created a chart by the original Martin scale. The numbering is reversed on the scale below in the (later) Martin–Schultz scale, which is (still) used in physical anthropology.
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