Because that is there only two favorite colors that they like.
Mixing yellow with grey will result in a muted, desaturated shade of yellow with a cooler undertone. The grey will tone down the vibrancy of the yellow, creating a softer, more subdued color.
yellow and grey = black :)
dark grey or black.
grey is not a color. the opposite of grey is grey.
Grey, because it is a shade and red, blue and yellow are bright colours.
You cannot mix grey with a single colour to form yellow. Yellow is made by mixing green and red. The addition of grey would render a dark shade of yellow.
dark grey or black.
Yellow and tiny bit of brown and grey
Most spaceships are unpainted.
They are spaceships used by aliens.
No aliens. No spaceships.
red,black,,brown,grey,yellow