Hex #556c4c or rgb(85,108,76) in RGB space is the tint of grass green. It has hue angle of 103.13 degrees, value = 42 and saturation = 30. #556c4c can be obtained by mixing 3 colors: 3 drops of magenta, 1 drop of blue, 5 drops of green.
Nearest safe hex - #666633. Below you can see the block with #556c4c color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #556c4c to the mixer and play with it.