Hex #506565 or rgb(80,101,101) in RGB space is the tint of cyan. It has hue angle of 180.00 degrees, value = 40 and saturation = 21. #506565 can be obtained by mixing 4 colors: 5 drops of magenta, 3 drops of cyan, 5 drops of green, 3 drops of black.
Nearest safe hex - #666666. Below you can see the block with #506565 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #506565 to the mixer and play with it.