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How to tell which type of mothball poisoning you're dealing with.
“In general, naphthalene ingestion requires more aggressive treatment than paradichlorobenzene. If the type of mothball ingested is unknown and the owner has brought in a sample, perform the following test. Add three heaping tablespoons of table salt to tepid water, and mix vigorously until the salt will no longer dissolve. Place the mothball in the saturated water. Naphthalene mothballs float, and paradichlorobenzene mothballs sink.”
-Camille Declementi, VMD
From Toxicology Brief: Moth repellent toxicosis