Hex #66ce55 or rgb(102,206,85) in RGB space is the tint of grass green. It has hue angle of 111.57 degrees, value = 81 and saturation = 59. #66ce55 can be obtained by mixing 4 colors: 5 drops of yellow, 1 drop of red, 5 drops of cyan, 4 drops of green.
Nearest safe hex - #66cc66. Below you can see the block with #66ce55 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66ce55 to the mixer and play with it.