Hex #304f56 or rgb(48,79,86) in RGB space is the tint of bluish cian. It has hue angle of 191.05 degrees, value = 34 and saturation = 44. #304f56 can be obtained by mixing 4 colors: 3 drops of magenta, 5 drops of blue, 5 drops of green, 3 drops of black.
Nearest safe hex - #336666. Below you can see the block with #304f56 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #304f56 to the mixer and play with it.