Hex #507440 or rgb(80,116,64) in RGB space is the tint of grass green. It has hue angle of 101.54 degrees, value = 45 and saturation = 45. #507440 can be obtained by mixing 4 colors: 5 drops of red, 4 drops of cyan, 5 drops of green, 2 drops of black.
Nearest safe hex - #666633. Below you can see the block with #507440 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #507440 to the mixer and play with it.