How to seal copper jewellery

Written by melissa j. bell
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How to seal copper jewellery
Copper locket. (copper pendant image by Allyson Ricketts from

Copper, which is one of the least expensive metals used in jewellery making, is also a little difficult to keep looking new. Copper jewellery often oxidises, or tarnishes, by turning green. This is usually due to age or environment, but can also happen in reaction to a person's body chemistry. Some people can wear unsealed copper with no ill effects, while others may experience copper oxidation after wearing a copper jewellery piece for a single day. To avoid oxidation and keep copper looking new, the copper must be sealed.

Skill level:

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Things you need

  • 237 ml (1 cup) lemon juice
  • 1 tbsp salt
  • Bowl
  • Copper jewellery
  • Water
  • Baking soda
  • Clear lacquer
  • Latex gloves

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  1. 1

    Create a cleaning solution to remove all oils from the surface of the copper jewellery. Mix 1 tbsp of salt into wheel brace of lemon juice and let the salt dissolve. Pour the mixture into a bowl.

  2. 2

    Put the copper jewellery into the lemon juice solution for a brief moment, then rinse it off with water.

  3. 3

    Rub a small amount of baking soda all over the surface of the copper to neutralise the acid from the lemon juice solution. Rinse the baking soda off the jewellery.

  4. 4

    Choose a clear lacquer. You can use a simple art product like Krylon Crystal Clear spray, or you can use a metal sealant like Everbrite Protective Coating.

  5. 5

    Lay out your copper jewellery piece on a protected work surface in a well-ventilated room or outdoors.

  6. 6

    Coat one side of the copper jewellery with your chosen lacquer. If you are using a spray lacquer, shake the can well before use and apply the spray in a smooth back-and-forth motion. If you are using a brush-on lacquer, use small, even strokes. Let the lacquer dry.

  7. 7

    Turn the copper jewellery piece over and coat the other side with lacquer. Let the lacquer dry again.

Tips and warnings

  • Put on a pair of latex gloves to avoid contaminating the copper jewellery with your skin oils.
  • You can also clean the surface of your copper with vinegar.
  • Do not use this method on copper jewellery that has gemstones. You must first remove the gemstones from their settings.
  • If you choose to work with a metal sealant, make sure to wear goggles and a face mask. The chemicals in this type of coating are highly toxic.

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