RYB color model as the "three" psychological primaries, with black and white occasionally added as a fourth and fifth. The cyan, magenta, and yellow primary colors associated with CMYK printing are sometimes known as "process blue", "process red" and "process yellow". RYB color model RYB (an abbreviation of red–yellow–blue) is a historical set of colors used in subtractive color mixing and is one commonly used set of primary colors. It is primarily used in art and design education, particularly painting. RYB predates modern scientific color theory, which has determined that cyan, magenta, and yellow are the best set of three colorants to combine,
Blue–green distinction in language for each of blue (""), green ("") and grey (""). For all three, different shades can be indicated with different (compound) terms, none of them being considered as basic color terms: "bleu " (light blue), "bleu " (sky blue), "bleu " (Navy blue), "bleu " (royal blue); "vert clair" (light green), "vert " (literally: apple green); "gris " (very dark grey), "gris " (literally: mouse grey). French also uses "" for the lighter shade of blue of the sunny sky, that was in turn loaned to English as "azure". Catalan distinguishes blue (') from green (') and grey ('). Other