Hex #99a333 or rgb(153,163,51) in RGB space is the tint of yellow. It has hue angle of 65.36 degrees, value = 64 and saturation = 69. #99a333 can be obtained by mixing 4 colors: 5 drops of yellow, 4 drops of red, 3 drops of cyan, 3 drops of green.
Nearest safe hex - #999933. Below you can see the block with #99a333 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #99a333 to the mixer and play with it.