Hex #557800 or rgb(85,120,0) in RGB space is the tint of lime. It has hue angle of 77.50 degrees, value = 47 and saturation = 100. #557800 can be obtained by mixing 4 colors: 3 drops of yellow, 1 drop of red, 4 drops of green, 4 drops of black.
Nearest safe hex - #666600. Below you can see the block with #557800 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #557800 to the mixer and play with it.