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
Disruptive Pattern Camouflage Uniform grey, sand, olive-green and red-brown. The new variant was designed to overcome issues associated with operating in and around the "green belt" areas of Afghanistan (particularly in corn fields) where the DPDU was too light in colour but where the DPCU was too green for open areas. Trials however, showed that in most areas the original DPCU performed more effectively than the new Midpoint camouflage and it was not adopted. One criticism was that the new camouflage used colours that were still too biased towards desert operations. Australian special forces operating in Afghanistan have been seen wearing Crye's Multicam camouflage.