Actually no. Black and white aren't colors.
"The same theory applies to black and white. ... Black is not a color; a black object absorbs all the colors of the visible spectrum and reflects none of them to the eyes. The grey area about black: A black object may look black, but, technically, it may still be reflecting some light." From Google
"Gray is an intermediate color between black and white. It is a neutral or achromatic color, meaning literally that it is a color "without color." It is the color of a cloud-covered sky, of ash and of lead." Also from Google.