Hex #99bd91 or rgb(153,189,145) in RGB space is the tint of grass green. It has hue angle of 109.09 degrees, value = 74 and saturation = 23. #99bd91 can be obtained by mixing 4 colors: 1 drop of red, 1 drop of blue, 3 drops of green, 5 drops of white.
Nearest safe hex - #99cc99. Below you can see the block with #99bd91 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #99bd91 to the mixer and play with it.