Achromatic:

Here is the  second 12 CHROMATIC STRATEGIES

2.         Achromatic: Colors that have no spectral hue - black, white, and full range of neutrals (combinations of three primaries).

An Achromatic concpt art. Digital image. Monochromatic and Achromatic Color Scheme. Xia Taptara, 2007. Web. 10 Dec. 2012.

This image is achromatic because the colors that have no spectral hue. 

p.s down on the bottom there is some achromatic cartoon.