Hex #99911a or rgb(153,145,26) in RGB space is the tint of yellow. It has hue angle of 56.22 degrees, value = 60 and saturation = 83. #99911a can be obtained by mixing 4 colors: 2 drops of yellow, 3 drops of red, 4 drops of green, 1 drop of white.
Nearest safe hex - #999933. Below you can see the block with #99911a color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #99911a to the mixer and play with it.