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
T99 (camouflage) Flecktarn (Tropentarn) camouflage, it is actually a recoloured variant of the original Danish M84 Pletsløring (spot camouflage) pattern, in which earthy red has replaced black, dark green has replaced light green, and the sand colour has replaced the olive green of the original M/84. T99 (camouflage) T/99 is the designation of the camouflage pattern of the Danish Armed Forces desert combat uniform. It is a 3 colour camouflage pattern, similar in design to the Danish M/84 pattern. It is considered to be the desert counterpart of M/84, and consists of different colors better suited for arid climates. The uniform contains