Hex #556a1d or rgb(85,106,29) in RGB space is the tint of lime. It has hue angle of 76.36 degrees, value = 42 and saturation = 73. #556a1d can be obtained by mixing 4 colors: 4 drops of yellow, 2 drops of blue, 1 drop of green, 5 drops of black.
Nearest safe hex - #666633. Below you can see the block with #556a1d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #556a1d to the mixer and play with it.