Inheritance Powder

A macabre synonym for powdered arsenic, which is intermittently popular as an poison that induces slow mental deterioration and vague gastrointestinal symptoms in its victims, who may have been poisoned by next-of-kin eager to inherit—hence the name—the victim’s worldly possessions
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Revealing the persistence of magical beliefs and practices into the late seventeenth century, her fascinating book uncovers numerous purveyors of poisons and "inheritance powders," magical services, and necromancers whose clientele reached high into the king's court.
The "affair of poisons" began in 1679, with the arrest of two fortunetellers in Paris who supplied their clients with poisons, or "inheritance powders," to expedite the demise of some intended victim, usually for financial gain.