Hex #55b142 or rgb(85,177,66) in RGB space is the tint of grass green. It has hue angle of 109.73 degrees, value = 69 and saturation = 63. #55b142 can be obtained by mixing 4 colors: 2 drops of yellow, 2 drops of blue, 4 drops of green, 1 drop of white.
Nearest safe hex - #669933. Below you can see the block with #55b142 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #55b142 to the mixer and play with it.