Potassium arsenite - AbsoluteAstronomy.com

Potassium arsenite is the compound which forms the basis of Fowler's solution

Fowler's solution

Fowler's solution is a solution containing potassium arsenite that once was prescribed as a remedy or a tonic. A Dr. Fowler of Stafford, England proposed its use in 1786 as a substitute for a patent medicine, "tasteless ague drop." It was prescribed in the United States until the late 1950s for a...

and is used as a specific rodenticide. It is toxic in humans.

Safety and health concerns

Currently, the substance is banned from the use for plant protection by the UK government

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