Hex #555447 or rgb(85,84,71) in RGB space is the tint of yellow. It has hue angle of 55.71 degrees, value = 33 and saturation = 16. #555447 can be obtained by mixing 4 colors: 3 drops of red, 1 drop of magenta, 4 drops of blue, 4 drops of green.
Nearest safe hex - #666633. Below you can see the block with #555447 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #555447 to the mixer and play with it.