Hex #9f9400 or rgb(159,148,0) in RGB space is the tint of yellow. It has hue angle of 55.85 degrees, value = 62 and saturation = 100. #9f9400 can be obtained by mixing 2 colors: 5 drops of yellow, 3 drops of black.
Nearest safe hex - #999900. Below you can see the block with #9f9400 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #9f9400 to the mixer and play with it.