Gum bichromate negatives of cyan, magenta, and yellow or red, green, and blue are used for a full-color image. Some photographers prefer substituting the cyan emulsion in the CMYK separations with a cyanotype layer. A simple duotone separation combining orange watercolor pigment and a cyanotype can yield surprisingly beautiful results. Low density photographic negatives of the same size as the final image are used for exposing the print. No enlarger is used, but instead, a contact printing frame or vacuum exposure frame is used with an ultraviolet light source such as a mercury vapor lamp, a common fluorescent black light, or the
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