Hex #99ac99 or rgb(153,172,153) in RGB space is the tint of green. It has hue angle of 120.00 degrees, value = 67 and saturation = 11. #99ac99 can be obtained by mixing 4 colors: 4 drops of red, 4 drops of cyan, 2 drops of green, 5 drops of white.
Nearest safe hex - #999999. Below you can see the block with #99ac99 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #99ac99 to the mixer and play with it.