Hex #99e599 or rgb(153,229,153) in RGB space is the tint of green. It has hue angle of 120.00 degrees, value = 90 and saturation = 33. #99e599 can be obtained by mixing 4 colors: 1 drop of yellow, 1 drop of cyan, 3 drops of green, 5 drops of white.
Nearest safe hex - #99cc99. Below you can see the block with #99e599 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #99e599 to the mixer and play with it.