Hex #55aa00 or rgb(85,170,0) in RGB space is the tint of olive. It has hue angle of 90.00 degrees, value = 67 and saturation = 100. #55aa00 can be obtained by mixing 3 colors: 2 drops of yellow, 3 drops of green, 1 drop of black.
Nearest safe hex - #669900. Below you can see the block with #55aa00 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #55aa00 to the mixer and play with it.