Human hair color account for all possible shades of brown, blond, or red (for example, platinum blond versus dark blond/light brown), nor does it explain why hair color sometimes darkens as a person ages. Several gene pairs control the light versus dark hair color in a cumulative effect. A person's genotype for a multifactorial trait can interact with the environment to produce varying phenotypes (see quantitative trait locus). Natural hair color can be brown, blond, black, red, or white; all natural hair colors including grey, white and lightest blond, are shades of brown. The Fischer–Saller scale, named after Eugen Fischer and , is
Palatinate (colour) Palatinate (colour) Palatinate or 'palatinate purple' is a purple colour associated with Durham University. It is used in the academic dress of Durham University and in the faculties of medicine and law at Newcastle University (being a former college of Durham University). The term has been used to refer to a number of different shades of purple. The Oxford English Dictionary defines it as a "light purple or lavender colour", which is used for Durham (and Newcastle) academic hoods. For corporate purposes Durham University uses a darker shade. A separate colour, 'palatinate blue', is derived from the Coat of Arms