Locals usually call this frost "bun upas". Antiarins are cardiac glycoside poisons produced by the upas tree ("Antiaris toxicaria"). Patients should use borage oil certified free of toxic unsaturated pyrrolizidine alkaloids (UPAs). On the local Javanese dialect, "Bun" (or "embun") means dew, while "upas" is poison. Warwick set upas a puppet kingHenry VI, whom he had himself previously helped depose.