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Top: A
poison-oak stem with black spots. The poison leaks out
wherever an injury occurs, and turns black when the air hits
it. Two of the leaf stalks also happen to have black spots.
Dr. Guin
popularized a “Black Spot Test”, which you can use to amaze
your friends. You’ll need three assistants and:
Plastic disposable glove
3 x
5 card
Snack sized Ziploc bag
Quart Ziploc
Scissors
Alcohol pledget
Two plastic grocery bags, one for the trash.
Slip on the
glove. Have someone hold the 3 x 5 card. Grasp a poison-oak
leaf with your gloved hand, and snip the leaf stalk with the
scissors. A drop of clear or milky fluid will form at the cut.
That amount, on bare skin, is enough to cause a rash in many
people; and it’s so easy to get that much on you, while out
for a walk! |
