Hex #5d888b or rgb(93,136,139) in RGB space is the tint of cyan. It has hue angle of 183.91 degrees, value = 55 and saturation = 33. #5d888b can be obtained by mixing 3 colors: 2 drops of cyan, 4 drops of white, 5 drops of black.
Nearest safe hex - #669999. Below you can see the block with #5d888b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #5d888b to the mixer and play with it.