Silver Dip

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[Hagerty] A commercial cleaning formulation used for removing tarnish and corrosion from silver, copper alloys, and rusted iron. Silver Dip contains: 8 ml of 85% orthophosphoric acid 7 grams of thiourea 0.2 milliliter of a wetting agent (e.g. Kodak® Photoflo) mixed and diluted to 100 milliliters with water (from Organ 1976).


  • Thiourea is carcinogenic.
  • Corrosive.
  • Skin contact will cause burns.

Resources and Citations

  • R.Organ, "The Corrosion of Tin, Copper, Iron and Steel and Lead" in Preservation and Conservation: Principles and Practices, Preservation Press, Washington DC, 1976, p. 249.
  • Website:

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