Evolution of human colour vision that are found between 450 and 625. Individuals with various forms of colour blindness such as deuteranopia and protanopia are missing human middle wavelength sensitive or long wavelength sensitive opsins. Their minimum wavelength differences are <5 but only at around 500. Protanopes, who are missing long wavelength sensitive cones, are unable to distinguish between colours in the green-yellow-red section of the electromagnetic spectrum. They find yellow, red and orange colours to have much lower brightness when compared to a trichromat. The dimming of these colours can result in confusion in many cases, such as when attempting to identify red traffic
British Colour Council British Colour Council The British Colour Council (BCC) was an industry standards organisation, active from the 1930s to the 1950s, which produced indexes of named colours for use by government, industry, academia, and horticulture. Founded in 1931 and chaired by designer Robert Francis Wilson, the BCC produced the British Colour Council reference Code or British Colour Codes: indexes of named colours for a variety of industries. Its first major work was the British Colour Council 1934 "Dictionary of Colour Standards" which defined colour shades in its printed plates and gave a two or three number code and evocative names to