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
Type 99 (camouflage) Type 99 (camouflage) Type 99 is a camouflage pattern used by People's Liberation Army of the People's Republic of China. Type 99 has developed many variants throughout its service, each with different designations and colour variants. For example, there are "Type 87", "Type 95", and "Type 03" patterns. The main variant is a four-colour woodland pattern with olive, green, yellowish-green and black. Type 99, like many other woodland uniforms with black, has been criticized for its use of this color, but once faded, it becomes dull and subdued, and therefore virtually unnoticeable. Type 99's style imitates that of the older