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
Blue–green distinction in language plant hues, and grey (like the sea); other shades of green would be referred to in Modern Irish as "uaine" or "uaithne", while "liath" is grey proper (like a stone). Scottish Gaelic uses the term "uaine" for "green". However, the dividing line between it and "gorm" is somewhat different than between the English "green" and "blue", with "uaine" signifying a light green or yellow-green, and "gorm" extending from dark blue (what in English might be navy blue) to include the dark green or blue-green of vegetation. Grass, for instance, is "gorm", rather than "uaine". In addition, "liath" covers a range