Hex #556c33 or rgb(85,108,51) in RGB space is the tint of olive. It has hue angle of 84.21 degrees, value = 42 and saturation = 53. #556c33 can be obtained by mixing 4 colors: 5 drops of red, 3 drops of cyan, 5 drops of green, 2 drops of black.
Nearest safe hex - #666633. Below you can see the block with #556c33 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #556c33 to the mixer and play with it.