Hex #999011 or rgb(153,144,17) in RGB space is the tint of yellow. It has hue angle of 56.03 degrees, value = 60 and saturation = 89. #999011 can be obtained by mixing 4 colors: 3 drops of yellow, 2 drops of red, 1 drop of magenta, 4 drops of green.
Nearest safe hex - #999900. Below you can see the block with #999011 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #999011 to the mixer and play with it.