Hex #554b1d or rgb(85,75,29) in RGB space is the tint of khaki. It has hue angle of 49.29 degrees, value = 33 and saturation = 66. #554b1d can be obtained by mixing 4 colors: 2 drops of red, 2 drops of magenta, 5 drops of green, 3 drops of black.
Nearest safe hex - #663333. Below you can see the block with #554b1d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #554b1d to the mixer and play with it.