Hex #556c6c or rgb(85,108,108) in RGB space is the tint of cyan. It has hue angle of 180.00 degrees, value = 42 and saturation = 21. #556c6c can be obtained by mixing 4 colors: 5 drops of magenta, 3 drops of cyan, 5 drops of green, 2 drops of black.
Nearest safe hex - #666666. Below you can see the block with #556c6c color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #556c6c to the mixer and play with it.