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
Hull Colour Pages and advertisers that it was necessary to split the directory into two separate books, business and residential. "Hull Colour Pages" continued to grow and in 1998 produced the UK's first full-colour business directory, changing the directory's name from "Hull Yellow Pages" to Hull Colour Pages in the process. After a rebrand of Kingston Communications to KC in 2010 the "Hull Colour Pages" was renamed "KC Colour Pages". In 1999 "Hull Colour Pages" launched its Online Directory which, whilst not the UK's first online directory, set the scene for further innovation when, in 2004, "Hull Colour Pages" launched the UK's first