Hex #00556d or rgb(0,85,109) in RGB space is the tint of bluish cian. It has hue angle of 193.21 degrees, value = 43 and saturation = 100. #00556d can be obtained by mixing 4 colors: 4 drops of blue, 2 drops of cyan, 1 drop of green, 4 drops of black.
Nearest safe hex - #006666. Below you can see the block with #00556d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #00556d to the mixer and play with it.