Hex #553c0b or rgb(85,60,11) in RGB space is the tint of khaki. It has hue angle of 39.73 degrees, value = 33 and saturation = 87. #553c0b can be obtained by mixing 4 colors: 4 drops of red, 1 drop of magenta, 5 drops of green, 5 drops of black.
Nearest safe hex - #663300. Below you can see the block with #553c0b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #553c0b to the mixer and play with it.