PTC paper, which is often used when discussing heredity in biology classes, is paper soaked with phenol thiocarbamide (PTC).
Ability to taste PTC is a hereditary trait. (The taste of PTC varies with the individual.) PTC paper, which is often used when discussing heredity in biology classes, is paper soaked with phenol thiocarbamide (PTC). The LD50 for PTC is 3.4 mg/kg. Such a low LD50 reveals that PTC is a very hazardous substance. The solution to make the taste test paper contains approximately 500ml of PTC per liter of water. Through some very crude arithmetic, we calculate that each strip of PTC paper would contain approximately 0.3 mg of PTC. We estimate that a student weighing about 50 kg. would have to lick (That is how the test is performed) and ingest about 500 2"" x 1/4"" strips of PTC paper to reach the LD50. You will have to judge if you wish to use this taste test paper."
WARNING
