Hex #556f33 or rgb(85,111,51) in RGB space is the tint of olive. It has hue angle of 86.00 degrees, value = 44 and saturation = 54. #556f33 can be obtained by mixing 4 colors: 2 drops of red, 5 drops of green, 3 drops of white, 5 drops of black.
Nearest safe hex - #666633. Below you can see the block with #556f33 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #556f33 to the mixer and play with it.