Hex #999566 or rgb(153,149,102) in RGB space is the tint of yellow. It has hue angle of 55.29 degrees, value = 60 and saturation = 33. #999566 can be obtained by mixing 3 colors: 1 drop of yellow, 2 drops of white, 2 drops of black.
Nearest safe hex - #999966. Below you can see the block with #999566 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #999566 to the mixer and play with it.