Chameleon turquoise, and purple. Chameleon skin has a superficial layer which contains pigments, and under the layer are cells with guanine crystals. Chameleons change colour by changing the space between the guanine crystals, which changes the wavelength of light reflected off the crystals which changes the colour of the skin. Colour change in chameleons has functions in camouflage, but most commonly in social signaling and in reactions to temperature and other conditions. The relative importance of these functions varies with the circumstances, as well as the species. Colour change signals a chameleon's physiological condition and intentions to other chameleons. Chameleons tend
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