Hex #55591c or rgb(85,89,28) in RGB space is the tint of yellow. It has hue angle of 63.93 degrees, value = 35 and saturation = 69. #55591c can be obtained by mixing 4 colors: 2 drops of red, 3 drops of green, 1 drop of white, 3 drops of black.
Nearest safe hex - #666633. Below you can see the block with #55591c color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #55591c to the mixer and play with it.