What ive used is 160proof grain alcohol....and 22mg/ml wouldnt even be close to happening. Are you sure this is correct?
Yeah, because it's practically insoluble in water -- which is what that last 20% (by volume) is. You can't just subtract that amount from the total volume and use the volume of 100% ethanol. It's like a testE solution -- it's dissolved in the solution, but just a couple drops of water will make some precipitate out.
PharmaFan