Hex #99d591 or rgb(153,213,145) in RGB space is the tint of green. It has hue angle of 112.94 degrees, value = 84 and saturation = 32. #99d591 can be obtained by mixing 4 colors: 1 drop of yellow, 1 drop of blue, 3 drops of green, 5 drops of white.
Nearest safe hex - #99cc99. Below you can see the block with #99d591 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #99d591 to the mixer and play with it.