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
Changing Faces (charity) surgical interventions by addressing the psychological and social challenges posed by disfigurement. Its services are based on academic research and informed by service users, including a Young People's Council. In 2012, the British Red Cross transferred its Skin Camouflage Service to Changing Faces. The service 'helps individuals to regain self-confidence and independence', and now operates at more than 120 locations throughout the UK. The charity's "Face Equality" campaign aims to ensure that people with disfigurement are treated without prejudice or discrimination. The campaign targets employers, schools, health care professionals, the media, policy makers and the general public, and has used