Hex #556e55 or rgb(85,110,85) in RGB space is the tint of green. It has hue angle of 120.00 degrees, value = 43 and saturation = 23. #556e55 can be obtained by mixing 4 colors: 5 drops of red, 3 drops of blue, 3 drops of cyan, 4 drops of green.
Nearest safe hex - #666666. Below you can see the block with #556e55 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #556e55 to the mixer and play with it.