Hex #555b4c or rgb(85,91,76) in RGB space is the tint of olive. It has hue angle of 84.00 degrees, value = 36 and saturation = 16. #555b4c can be obtained by mixing 4 colors: 1 drop of yellow, 1 drop of blue, 2 drops of white, 5 drops of black.
Nearest safe hex - #666633. Below you can see the block with #555b4c color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #555b4c to the mixer and play with it.