Hex #507d8b or rgb(80,125,139) in RGB space is the tint of bluish cian. It has hue angle of 194.24 degrees, value = 55 and saturation = 42. #507d8b can be obtained by mixing 4 colors: 5 drops of magenta, 2 drops of blue, 4 drops of cyan, 5 drops of green.
Nearest safe hex - #666699. Below you can see the block with #507d8b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #507d8b to the mixer and play with it.