Hex #559f00 or rgb(85,159,0) in RGB space is the tint of olive. It has hue angle of 87.92 degrees, value = 62 and saturation = 100. #559f00 can be obtained by mixing 3 colors: 3 drops of yellow, 4 drops of green, 2 drops of black.
Nearest safe hex - #669900. Below you can see the block with #559f00 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #559f00 to the mixer and play with it.