Hex #153c47 or rgb(21,60,71) in RGB space is the tint of bluish cian. It has hue angle of 193.20 degrees, value = 28 and saturation = 70. #153c47 can be obtained by mixing 4 colors: 1 drop of red, 5 drops of blue, 2 drops of green, 4 drops of black.
Nearest safe hex - #003333. Below you can see the block with #153c47 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #153c47 to the mixer and play with it.