Hex #00b588 or rgb(0,181,136) in RGB space is the tint of greenish cian. It has hue angle of 165.08 degrees, value = 71 and saturation = 100. #00b588 can be obtained by mixing 3 colors: 1 drop of blue, 2 drops of cyan, 2 drops of green.
Nearest safe hex - #00cc99. Below you can see the block with #00b588 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #00b588 to the mixer and play with it.