Hex #99e080 or rgb(153,224,128) in RGB space is the tint of grass green. It has hue angle of 104.38 degrees, value = 88 and saturation = 43. #99e080 can be obtained by mixing 3 colors: 1 drop of yellow, 4 drops of green, 5 drops of white.
Nearest safe hex - #99cc99. Below you can see the block with #99e080 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #99e080 to the mixer and play with it.