Hex #99901a or rgb(153,144,26) in RGB space is the tint of yellow. It has hue angle of 55.75 degrees, value = 60 and saturation = 83. #99901a can be obtained by mixing 3 colors: 5 drops of yellow, 1 drop of white, 4 drops of black.
Nearest safe hex - #999933. Below you can see the block with #99901a color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #99901a to the mixer and play with it.