Assertion: arsenic | /r/ObjectUse | used in medicine
Facets:
value: over the past 500 years
type: TEMPORAL
value: as a wood preservative
type: PURPOSE
value: historically
type: TEMPORAL
Source sentences:
text: Historically, arsenic has been used in fertilizers and medicines, and as a wood preservative; however, exposure to it over time may lead to skin diseases, impaired biochemical process, and various types of cancer.
text: Arsenic has been used in many medicines and was widely used to treat syphilis until the mid 20th century.
text: Arsenic trioxide has been used in a variety of ways over the past 500 years, most commonly in the treatment of cancer , but in medications as diverse as Fowler's solution in psoriasis .  
text: Arsenic is also used in some medicines, although this use has declined as our knowledge of the element’s harmful effects has increased.