Hex #999660 or rgb(153,150,96) in RGB space is the tint of yellow. It has hue angle of 56.84 degrees, value = 60 and saturation = 37. #999660 can be obtained by mixing 4 colors: 4 drops of red, 1 drop of blue, 5 drops of green, 5 drops of white.
Nearest safe hex - #999966. Below you can see the block with #999660 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #999660 to the mixer and play with it.