Pharaoh cuttlefish they can show a mottled white and brown color, with a center circle of brown. The mechanism for color is the same in the Pharaoh cuttlefish as it is in other cuttlefish. This colour-changing function is produced by groups of red, yellow, brown, and black pigmented chromatophores above a layer of reflective blue and green tinted iridophores and leucophores, with up to 200 of these specialized pigment cells per square millimeter. These sacs of color are controlled by rings of muscle around the sac. The cuttlefish expands and contracts these muscle rings in order to show different colors. It is
Shades of green color bright green is used to represent bright green environmentalism or the Viridian design movement. Displayed at right is the color "bright mint". "Brunswick green" is a common name for green pigments made from copper compounds, although the name has also been used for other formulations that produce a similar hue, such as mixtures of chrome yellow and Prussian blue. The pigment is named after Braunschweig, Germany (also known as Brunswick in English) where it was first manufactured. It is a deep, dark green, which may vary from intense to very dark, almost black. The first recorded use of "Brunswick