Hex #555f4e or rgb(85,95,78) in RGB space is the tint of olive. It has hue angle of 95.29 degrees, value = 37 and saturation = 18. #555f4e can be obtained by mixing 4 colors: 4 drops of magenta, 1 drop of cyan, 5 drops of green, 2 drops of black.
Nearest safe hex - #666666. Below you can see the block with #555f4e color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #555f4e to the mixer and play with it.