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  • Title: The black spot test for recognizing poison ivy and related species.
    Author: Guin JD.
    Journal: J Am Acad Dermatol; 1980 Apr; 2(4):332-3. PubMed ID: 6444959.
    Abstract:
    A black, enamel-like deposit is frequently present on injured areas of poison ivy, poison oak, and poison sumac. This finding can also be produced deliberately as a field test for the toxic nature of the plant. Observing proper precautions, one crushes sap from leaves onto a sheet of white paper. The resulting stain should darken on exposure to the air if it came from a Toxicodendron. This test employs only one quality of these plants, and it is not, therefore, a substitute for other proved means of identification.
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