Hex #507d55 or rgb(80,125,85) in RGB space is the tint of green. It has hue angle of 126.67 degrees, value = 49 and saturation = 36. #507d55 can be obtained by mixing 4 colors: 5 drops of red, 2 drops of blue, 4 drops of cyan, 5 drops of green.
Nearest safe hex - #666666. Below you can see the block with #507d55 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #507d55 to the mixer and play with it.