Hex #55d640 or rgb(85,214,64) in RGB space is the tint of grass green. It has hue angle of 111.60 degrees, value = 84 and saturation = 70. #55d640 can be obtained by mixing 3 colors: 4 drops of yellow, 3 drops of cyan, 5 drops of green.
Nearest safe hex - #66cc33. Below you can see the block with #55d640 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #55d640 to the mixer and play with it.