Hex #00634d or rgb(0,99,77) in RGB space is the tint of greenish cian. It has hue angle of 166.67 degrees, value = 39 and saturation = 100. #00634d can be obtained by mixing 4 colors: 3 drops of blue, 1 drop of cyan, 3 drops of green, 3 drops of black.
Nearest safe hex - #006666. Below you can see the block with #00634d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #00634d to the mixer and play with it.