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  • Identify the type of metal before attempting any cleaning.
  • Only consider removing a patina after ascertaining that the surface of the object is not as originally intended and that the patina is not providing protection against further corrosion.
  • Wear gloves when handling highly polished artefacts.
  • Keep relative humidity below 45 % for most metals in good condition and below 35 % for iron and metals showing signs of corrosion.
  • Observe maximum light levels of 300 lux for metal objects and lower levels as appropriate for composite objects with light sensitive components.
  • Where possible, store metals in enamelled or powder-coated metal cupboards or acid-free boxes.
  • Do not carry out any treatment if unsure. Contact a conservator for advice.
  • Contact a conservator for advice regarding the treatment of composite objects.