Hex #99900b or rgb(153,144,11) in RGB space is the tint of yellow. It has hue angle of 56.20 degrees, value = 60 and saturation = 93. #99900b can be obtained by mixing 4 colors: 5 drops of yellow, 4 drops of red, 1 drop of blue, 5 drops of green.
Nearest safe hex - #999900. Below you can see the block with #99900b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #99900b to the mixer and play with it.