Hex #5b8b8c or rgb(91,139,140) in RGB space is the tint of cyan. It has hue angle of 181.22 degrees, value = 55 and saturation = 35. #5b8b8c can be obtained by mixing 4 colors: 2 drops of yellow, 3 drops of red, 4 drops of blue, 5 drops of cyan.
Nearest safe hex - #669999. Below you can see the block with #5b8b8c color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #5b8b8c to the mixer and play with it.