Hex #15455d or rgb(21,69,93) in RGB space is the tint of bluish cian. It has hue angle of 200.00 degrees, value = 36 and saturation = 77. #15455d can be obtained by mixing 4 colors: 1 drop of yellow, 5 drops of blue, 1 drop of cyan, 5 drops of black.
Nearest safe hex - #003366. Below you can see the block with #15455d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #15455d to the mixer and play with it.