Cyan , also called aqua , is the blue-green color that is between blue and green on a modern RGB color wheel .
On the old fashioned , now obsolete but still occasionally used red-yellow-blue pigment color wheel ( in which red , yellow , and blue were regarded as the primary colors and orange , green , and violet were regarded as the secondary colors ) , blue-green was a tertiary color between blue and green on the red-yellow-blue pigment color wheel .