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
William Herapath (chemist) William Herapath (chemist) William Herapath (1796–1868) was an English analytical chemist and political reformer. Herapath was born in Bristol, where father was a maltster in St. Philip's parish, and after his death succeeded to the business. He gave it up in order to study chemistry. He was one of the founders of the Chemical Society of London, of which he was a fellow, and also of the Bristol Medical School, of which he became professor of chemistry and toxicology on its opening in 1828. On 13 April 1835, at the trial of a woman named Burdock for poisoning by arsenic