Hex #559a40 or rgb(85,154,64) in RGB space is the tint of grass green. It has hue angle of 106.00 degrees, value = 60 and saturation = 58. #559a40 can be obtained by mixing 4 colors: 1 drop of yellow, 3 drops of red, 3 drops of cyan, 5 drops of green.
Nearest safe hex - #669933. Below you can see the block with #559a40 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #559a40 to the mixer and play with it.