Hex #999b66 or rgb(153,155,102) in RGB space is the tint of yellow. It has hue angle of 62.26 degrees, value = 61 and saturation = 34. #999b66 can be obtained by mixing 4 colors: 3 drops of red, 1 drop of cyan, 3 drops of green, 3 drops of white.
Nearest safe hex - #999966. Below you can see the block with #999b66 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #999b66 to the mixer and play with it.