Hex #304d6b or rgb(48,77,107) in RGB space is the tint of blue. It has hue angle of 210.51 degrees, value = 42 and saturation = 55. #304d6b can be obtained by mixing 4 colors: 3 drops of red, 4 drops of blue, 4 drops of cyan, 5 drops of black.
Nearest safe hex - #336666. Below you can see the block with #304d6b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #304d6b to the mixer and play with it.