Hex #557942 or rgb(85,121,66) in RGB space is the tint of grass green. It has hue angle of 99.27 degrees, value = 47 and saturation = 45. #557942 can be obtained by mixing 4 colors: 3 drops of yellow, 2 drops of blue, 1 drop of cyan, 3 drops of black.
Nearest safe hex - #666633. Below you can see the block with #557942 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #557942 to the mixer and play with it.