Hex #999b99 or rgb(153,155,153) in RGB space is the tint of green. It has hue angle of 120.00 degrees, value = 61 and saturation = 1. #999b99 can be obtained by mixing 4 colors: 3 drops of magenta, 1 drop of cyan, 3 drops of green, 3 drops of white.
Nearest safe hex - #999999. Below you can see the block with #999b99 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #999b99 to the mixer and play with it.