Hex #557f00 or rgb(85,127,0) in RGB space is the tint of lime. It has hue angle of 79.84 degrees, value = 50 and saturation = 100. #557f00 can be obtained by mixing 4 colors: 1 drop of yellow, 2 drops of red, 5 drops of green, 1 drop of black.
Nearest safe hex - #666600. Below you can see the block with #557f00 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #557f00 to the mixer and play with it.