Hex #555015 or rgb(85,80,21) in RGB space is the tint of yellow. It has hue angle of 55.31 degrees, value = 33 and saturation = 75. #555015 can be obtained by mixing 4 colors: 4 drops of red, 1 drop of cyan, 4 drops of green, 3 drops of black.
Nearest safe hex - #666600. Below you can see the block with #555015 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #555015 to the mixer and play with it.