Hex #556956 or rgb(85,105,86) in RGB space is the tint of green. It has hue angle of 123.00 degrees, value = 41 and saturation = 19. #556956 can be obtained by mixing 4 colors: 1 drop of yellow, 1 drop of red, 3 drops of blue, 1 drop of green.
Nearest safe hex - #666666. Below you can see the block with #556956 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #556956 to the mixer and play with it.