Hex #556b55 or rgb(85,107,85) in RGB space is the tint of green. It has hue angle of 120.00 degrees, value = 42 and saturation = 21. #556b55 can be obtained by mixing 4 colors: 3 drops of magenta, 1 drop of cyan, 4 drops of green, 1 drop of black.
Nearest safe hex - #666666. Below you can see the block with #556b55 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #556b55 to the mixer and play with it.