Hex #555039 or rgb(85,80,57) in RGB space is the tint of khaki. It has hue angle of 49.29 degrees, value = 33 and saturation = 33. #555039 can be obtained by mixing 3 colors: 3 drops of magenta, 4 drops of green, 2 drops of black.
Nearest safe hex - #666633. Below you can see the block with #555039 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #555039 to the mixer and play with it.