Hex #005240 or rgb(0,82,64) in RGB space is the tint of greenish cian. It has hue angle of 166.83 degrees, value = 32 and saturation = 100. #005240 can be obtained by mixing 3 colors: 2 drops of cyan, 1 drop of green, 5 drops of black.
Nearest safe hex - #006633. Below you can see the block with #005240 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #005240 to the mixer and play with it.