Hex #999b33 or rgb(153,155,51) in RGB space is the tint of yellow. It has hue angle of 61.15 degrees, value = 61 and saturation = 67. #999b33 can be obtained by mixing 4 colors: 3 drops of yellow, 3 drops of red, 2 drops of cyan, 2 drops of green.
Nearest safe hex - #999933. Below you can see the block with #999b33 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #999b33 to the mixer and play with it.