Hex #555813 or rgb(85,88,19) in RGB space is the tint of yellow. It has hue angle of 62.61 degrees, value = 35 and saturation = 78. #555813 can be obtained by mixing 4 colors: 3 drops of red, 1 drop of blue, 4 drops of green, 1 drop of black.
Nearest safe hex - #666600. Below you can see the block with #555813 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #555813 to the mixer and play with it.