Hex #15425d or rgb(21,66,93) in RGB space is the tint of blue. It has hue angle of 202.50 degrees, value = 36 and saturation = 77. #15425d can be obtained by mixing 4 colors: 5 drops of blue, 1 drop of green, 1 drop of white, 5 drops of black.
Nearest safe hex - #003366. Below you can see the block with #15425d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #15425d to the mixer and play with it.