CMYK color model of the primaries: cyan and yellow produce green, cyan and magenta produce blue, yellow and magenta produce red (these subtractive secondary colors correspond roughly to the additive primary colors), plus layering all three of them resulting in black. With halftoning, a full continuous range of colors can be produced. To improve print quality and reduce moiré patterns, the screen for each color is set at a different angle. While the angles depend on how many colors are used and the preference of the press operator, typical CMYK process printing uses any of the following screen angles: The "black" generated by
Blue–green distinction in language in Amazigh language is "Azerwal". In some dialects of Amazigh, like Shilha, the word "Azegzaw" is used for both green and blue. The color of the sky is sometimes referred to as "the green" in Classical Arabic poetry, in which it is al-khaḍrā' (). In Arabic the word for blue is generally "azraq" (). The Arabic word for green is "akhḍar" (). In Moroccan Arabic, the word for light blue is "šíbi", whereas "zraq" () stands for blue and "khḍar" () for green. The word "zrag" () is used to describe the color of a suffocated person, and is also