Hex #99972b or rgb(153,151,43) in RGB space is the tint of yellow. It has hue angle of 58.91 degrees, value = 60 and saturation = 72. #99972b can be obtained by mixing 4 colors: 5 drops of yellow, 1 drop of blue, 1 drop of white, 3 drops of black.
Nearest safe hex - #999933. Below you can see the block with #99972b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #99972b to the mixer and play with it.