Hex #557d1c or rgb(85,125,28) in RGB space is the tint of olive. It has hue angle of 84.74 degrees, value = 49 and saturation = 78. #557d1c can be obtained by mixing 4 colors: 3 drops of yellow, 1 drop of cyan, 1 drop of green, 4 drops of black.
Nearest safe hex - #666633. Below you can see the block with #557d1c color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #557d1c to the mixer and play with it.