Hex #15515d or rgb(21,81,93) in RGB space is the tint of bluish cian. It has hue angle of 190.00 degrees, value = 36 and saturation = 77. #15515d can be obtained by mixing 4 colors: 5 drops of blue, 2 drops of green, 1 drop of white, 4 drops of black.
Nearest safe hex - #006666. Below you can see the block with #15515d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #15515d to the mixer and play with it.