Hex #559733 or rgb(85,151,51) in RGB space is the tint of grass green. It has hue angle of 99.60 degrees, value = 59 and saturation = 66. #559733 can be obtained by mixing 4 colors: 5 drops of yellow, 3 drops of cyan, 2 drops of green, 5 drops of black.
Nearest safe hex - #669933. Below you can see the block with #559733 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #559733 to the mixer and play with it.