Hex #555c5f or rgb(85,92,95) in RGB space is the tint of bluish cian. It has hue angle of 198.00 degrees, value = 37 and saturation = 11. #555c5f can be obtained by mixing 4 colors: 2 drops of yellow, 1 drop of red, 5 drops of blue, 1 drop of black.
Nearest safe hex - #666666. Below you can see the block with #555c5f color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #555c5f to the mixer and play with it.