Hex #99ad00 or rgb(153,173,0) in RGB space is the tint of yellow. It has hue angle of 66.94 degrees, value = 68 and saturation = 100. #99ad00 can be obtained by mixing 4 colors: 5 drops of yellow, 1 drop of red, 3 drops of green, 1 drop of black.
Nearest safe hex - #999900. Below you can see the block with #99ad00 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #99ad00 to the mixer and play with it.