My bottle of Edwal hypo check test's instructions on the bottle are worn off and as I remember the instruction for testing paper rapid fixer was to add a couple drops to an ounce or so, (I used 10-20 mls in a graduated cylinder) and swirl the mixture. If the milkiness disappears, then it's still good. Can anyone confirm this from their bottle or experience? Just want to make sure my memory isn't completely awol. Thanks Eric