Black and yellow will make olive green. Be careful of adding too much black though. Just a little black goes a long way to giving you a beautiful shade of olive. You can adjust the depth of the olive green by the use (more or less) of black.
a not vey nice colour
yellow, magenta and cyan
black and yellow
When yellow is added to black, it creates a shade of dark green or olive green, depending on the ratios of the colors used. Mixing yellow with black can also create a muddy or murky greenish-brown color.
It depends, do you think brown is perfect?
Yellow + Blue = Green Blue + Red = Purple Red + White = Pink Red + Yellow = Orange Black + White = Grey Adding white to a colour will make it lighter (except red, which makes a completely new colour - pink) Adding a little black to a colour will make it darker.
You could get a mossy green colour (colour of the bag below) though it can change depending on how much yellow you put in.
yellow - voilet - brown or yellow - voilet - black - black
Mixing those colors will result in a neutral gray color.
yellow
yellow blue and black
black and yellow