Evolution of human colour vision opsins was increasing from 400 to 430. During this time, Ancestral Boreotherian had two long wave length opsins created by gene duplication, with one retaining the absolute max value of 560, equal to the ancestral value. This led to the creation of the modern human long wavelength sensitive, or red opsin. The other short wavelength sensitive opsin decreased its absolute max value to 530 and became the middle wavelength sensitive, or green-sensitive opsin. This occurred through mutations involving S180A, Y277F and T285A. The order that these mutations took place in the ancestral Boreotheria is currently not fully known. It is
George Palmer (colour theorist) Leipzig four short works on various inventions, one being a fire-extinguishing powder. A demonstration in a pharmacy of the use of the powder was described in a Niedersachsen newspaper. In 1811 Palmer moved to Copenhagen into retirement and died there destitute in 1826. Palmer made a lasting contribution to the development of colour science by being the first to speculate that there are three different mechanisms in the human eye that account for colour vision: "The superficies of the retina is compounded of particles of three different kinds, analogous to the three rays of light; and each of these particles