Hex #99a700 or rgb(153,167,0) in RGB space is the tint of yellow. It has hue angle of 65.03 degrees, value = 65 and saturation = 100. #99a700 can be obtained by mixing 3 colors: 2 drops of yellow, 1 drop of red, 2 drops of green.
Nearest safe hex - #999900. Below you can see the block with #99a700 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #99a700 to the mixer and play with it.