Hex #809991 or rgb(128,153,145) in RGB space is the tint of greenish cian. It has hue angle of 160.80 degrees, value = 60 and saturation = 16. #809991 can be obtained by mixing 4 colors: 1 drop of blue, 1 drop of green, 5 drops of white, 3 drops of black.
Nearest safe hex - #999999. Below you can see the block with #809991 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #809991 to the mixer and play with it.