Hex #557355 or rgb(85,115,85) in RGB space is the tint of green. It has hue angle of 120.00 degrees, value = 45 and saturation = 26. #557355 can be obtained by mixing 3 colors: 1 drop of green, 2 drops of white, 3 drops of black.
Nearest safe hex - #666666. Below you can see the block with #557355 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #557355 to the mixer and play with it.