Hex #556350 or rgb(85,99,80) in RGB space is the tint of grass green. It has hue angle of 104.21 degrees, value = 39 and saturation = 19. #556350 can be obtained by mixing 4 colors: 5 drops of red, 4 drops of blue, 2 drops of cyan, 4 drops of green.
Nearest safe hex - #666666. Below you can see the block with #556350 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #556350 to the mixer and play with it.