Hex #55d439 or rgb(85,212,57) in RGB space is the tint of grass green. It has hue angle of 109.16 degrees, value = 83 and saturation = 73. #55d439 can be obtained by mixing 3 colors: 3 drops of yellow, 2 drops of cyan, 4 drops of green.
Nearest safe hex - #66cc33. Below you can see the block with #55d439 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #55d439 to the mixer and play with it.