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THAT a Solution of Silver will colour Hair black, hath often been found. And I have observ'd, that Silver dissolv'd in Aq. Fortis, and evaporated ad siccitatem, and clear'd from their greenish Blewness by a successive Affusion and Evaporation of fair Water; this Calx being laid either upon the Skin or Hafts of Knives, would stain them with a lasting black Co∣lour.