Hex #556039 or rgb(85,96,57) in RGB space is the tint of lime. It has hue angle of 76.92 degrees, value = 38 and saturation = 41. #556039 can be obtained by mixing 4 colors: 2 drops of red, 1 drop of magenta, 2 drops of blue, 4 drops of green.
Nearest safe hex - #666633. Below you can see the block with #556039 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #556039 to the mixer and play with it.