Hex #99e199 or rgb(153,225,153) in RGB space is the tint of green. It has hue angle of 120.00 degrees, value = 88 and saturation = 32. #99e199 can be obtained by mixing 2 colors: 2 drops of green, 3 drops of white.
Nearest safe hex - #99cc99. Below you can see the block with #99e199 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #99e199 to the mixer and play with it.