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) American M81 Woodland camouflage, in the sense it utilizes a macropattern of four colours for concealment, printed in interlocking, elongated and branching blobs. Type 99 uses a yellowish-green colour for its fourth colour, as opposed to the US pattern's khaki. Currently, Type 99 remains the standard utility and field uniform of the PLA. Currently, the Type 87 Combat & Training Uniform is being replaced by the new Type 07 Combat & Training Uniform. 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