Hex #558142 or rgb(85,129,66) in RGB space is the tint of grass green. It has hue angle of 101.90 degrees, value = 51 and saturation = 49. #558142 can be obtained by mixing 4 colors: 2 drops of magenta, 5 drops of green, 1 drop of white, 1 drop of black.
Nearest safe hex - #669933. Below you can see the block with #558142 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #558142 to the mixer and play with it.