#caustic  any chemical substance that burns or destroys living tissue
  supertype:  #chemical_compound__compound  (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight
  subtype:  #lye  a strong solution of sodium or potassium hydroxide
  subtype:  #silver_nitrate  a nitrate used in making photographic emulsions; also used in medicine as a cautery and as a topical anti-infective agent
     subtype:  #lunar_caustic__lunarcaustic  silver nitrate fused into sticks and formerly used as a caustic

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