Hex #155f15 or rgb(21,95,21) in RGB space is the tint of green. It has hue angle of 120.00 degrees, value = 37 and saturation = 78. #155f15 can be obtained by mixing 4 colors: 1 drop of red, 1 drop of cyan, 5 drops of green, 5 drops of black.
Nearest safe hex - #006600. Below you can see the block with #155f15 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #155f15 to the mixer and play with it.