Hex #556e2e or rgb(85,110,46) in RGB space is the tint of olive. It has hue angle of 83.44 degrees, value = 43 and saturation = 58. #556e2e can be obtained by mixing 4 colors: 5 drops of yellow, 4 drops of blue, 1 drop of green, 5 drops of black.
Nearest safe hex - #666633. Below you can see the block with #556e2e color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #556e2e to the mixer and play with it.