PTC TASTE PAPER - Phenol Thiorcabamide 100 Strips Vial Vial of 100. We estimate that a student weighing about 110 lbs would have to lick (which is how the test is Through some very crude arithmetic, we calculate that each strip of PTC paper would contain The solution to make the taste test paper, contains approximately 500ml of PTC per liter of water. Such a low LD50 reveals than PTC is a very hazardous substance.