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 of changes. It is influenced partly by early US Jungle Camouflage patterns, such as "Duck Hunter"/"Frog-Skin". DPCU was developed following aerial photographs of the Australian terrain to determine which colours and patterns would be most suitable for camouflage uniforms. The selected five colour pattern consists of a greenish sand coloured background with randomly arranged spots of orange-brown, mid-brown, leaf-green and very dark green overlaid. While a mid-grey tone was included in early test uniforms, this was omitted in later uniforms in favour of a second brown tone. The standard DPCU works in areas from arid bushland through to tropical jungle