Anti-Tarnish Coating for Silver Jewelry and Coins using nSILVER Coating Process by Beneq

Topics Covered

nSILVER - Anti-Tarnish Coating for Silver Jewelry and Coins
Proven Performance of nSILVER
Appearance of nSILVER-Coated Articles


Beneq Oy, based in Finland, is a supplier of equipment and coating technology for global markets. Beneq turns innovations into success by developing applications and equipment for cleantech and renewable energy fields, especially in glass, solar and emerging thin film markets. Coating applications include optics, barriers and passivation layers, as well as energy generation and conservation. Beneq also offers complete coating services. Beneq's coating applications are based on two enabling nanotechnology platforms: Atomic Layer Deposition (ALD) and aerosol coating (nHALO® and nAERO®).

nSILVER - Anti-Tarnish Coating for Silver Jewelry and Coins

Tarnishing is a well-known phenomenon in the silver industry. Tarnishing is mainly caused by airborne sulfur, which reacts with the surface of silver and produces black silver sulfide (Ag2S). nSILVER®, a unique coating process developed by Beneq, is a fundamental solution for the protection of silver against tarnishing. For nSILVER, Beneq now provides turnkey solutions for industrial scale production, e.g., the TFS 500 Thin Film System for ALD coating.

nSILVER Anti-Tarnish Coating

The invisible nSILVER anti-tarnish property is based on coating silver with a fully transparent, conformal two-component thin film. The dual layer structure of nSILVER consists of two ceramic materials: aluminum oxide (Al2O3) and titanium dioxide (TiO2). While the bottom layer acts as a bonding layer with good adherence to the silver, the top layer acts as a barrier layer through which liquids and other aggressive chemicals cannot penetrate.

Proven Performance of nSILVER

nSILVER has been subjected to numerous industrially acknowledged anti-tarnish tests, and the results have been overwhelmingly impressive. nSILVER has proven its superior performance in the following tests:

  • Salt spray test (DIN 50021 SS)
  • Kesternich test (DIN 50018 KFW 0,2S)
  • Sweat, seawater and perfume resistance tests
  • Dilution resistance (alcohols and ketones)
  • Climate test (DIN 58390-12-120, sharpness grade 7)
  • UV exposure test (Sol 2)
  • Commercial washing machine test
  • Chemical dry-cleaning test

Appearance of nSILVER-Coated Articles

The dual nSILVER coating is optimized to be completely transparent on silver. However, the coating factually enhances the reflectivity of the surface, which gives an nSILVER coated article a brighter and more glossy appearance than silver itself.

Source: Beneq

For more information on this source please visit Beneq


  1. ELISA SALAT ELISA SALAT United States says:

    Where do I find this product nSILVER® Anti-tarnish Coating?

  2. Jenny Setiawan Jenny Setiawan Indonesia says:

    Hi,, im interested to have more information regarding the Anti-tarnish for silver jewerly, i am based in Indonesia and where can i get more information about this product?
    thank you

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