Hex #554b39 or rgb(85,75,57) in RGB space is the tint of khaki. It has hue angle of 38.57 degrees, value = 33 and saturation = 33. #554b39 can be obtained by mixing 3 colors: 4 drops of magenta, 5 drops of green, 3 drops of black.
Nearest safe hex - #663333. Below you can see the block with #554b39 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #554b39 to the mixer and play with it.