Hex #559015 or rgb(85,144,21) in RGB space is the tint of olive. It has hue angle of 88.78 degrees, value = 56 and saturation = 85. #559015 can be obtained by mixing 4 colors: 4 drops of yellow, 1 drop of cyan, 3 drops of green, 4 drops of black.
Nearest safe hex - #669900. Below you can see the block with #559015 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #559015 to the mixer and play with it.