Hex #999333 or rgb(153,147,51) in RGB space is the tint of yellow. It has hue angle of 56.47 degrees, value = 60 and saturation = 67. #999333 can be obtained by mixing 4 colors: 1 drop of yellow, 3 drops of red, 4 drops of green, 2 drops of white.
Nearest safe hex - #999933. Below you can see the block with #999333 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #999333 to the mixer and play with it.