Color blindness all variations in human color vision involve the red and green receptors in male eyes. It is very rare for males or females to be "blind" to the blue end of the spectrum. The first scientific paper on the subject of color blindness, "Extraordinary facts relating to the vision of colours", was published by the English chemist John Dalton in 1798 after the realization of his own color blindness. Because of Dalton's work, the general condition has been called "daltonism", although in English this term is now used only for deuteranopia. Color codes present particular problems for those with color
John Potter (chemist) John Potter (chemist) John Hubert Potter (1927 – 17 July 2017) was an English chemist who falsely claimed to be a Special Operations Executive agent who worked with the French resistance during World War II. John Hubert Potter was born in Camberwell, south London, in 1927. He was born with a club foot which was later corrected. Potter married, first, Olive with whom he had six children, Anne, Roy, Hugh, Neil, Nigel, and Mark. After a divorce, he married Mildred in 1976, a hairdresser he met while travelling in Vienna in 1970. Potter had a career as a research chemist