Hex #557c55 or rgb(85,124,85) in RGB space is the tint of green. It has hue angle of 120.00 degrees, value = 49 and saturation = 31. #557c55 can be obtained by mixing 4 colors: 4 drops of red, 4 drops of cyan, 3 drops of green, 1 drop of black.
Nearest safe hex - #666666. Below you can see the block with #557c55 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #557c55 to the mixer and play with it.