Beneq nSILVER anti-tarnish coating protects silver jewelry and coins

nSILVER® Anti-tarnish Coating


Does your jewelry tarnish before it reaches the retailer? We have the solution.

Tarnishing is a long–established challenge in the silver industry. Oxidation, sulfidation and corrosion cause discoloration of the silver surface, which decrease the shelf-life of silver products and collector items.

nSILVER, is an industrial-scale turnkey production solution for the protection of silver against tarnishing. It consists of optimized anti-tarnish production equipment and a unique coating process developed and patented by Beneq.

Benefits of nSILVER:

  • Invisible
  • Significant tarnish resistance improvement
  • Safe coating materials
  • Low cost of operating
  • High capacity
  • Good fit to existing manufacturing processes and logistics
  • Proven and robust technology


Proven performance

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.

Invisible protection

nSILVER is based on atomic layer deposition (ALD), a coating technology that enables growing of thin films on articles of any shape and orientation. It provides an ultrathin and totally conformal anti-tarnish coating, which is fully transparent on silver. The coating is pinhole-free and extremely uniform over the entire batch of coated articles.

Eliminating the white spots

The protective properties of nSILVER, besides preventing tarnishing, also impede the formation of white spots, which are material surface flaws characteristic of silver coins.

Protection of gold and copper

In addition to nSILVER, which was originally developed and optimized for anti-tarnish protection of silver, Beneq has also developed special coatings to protect copper and gold. All metals (silver, copper and gold) can be coated with the same equipment with special coating stacks, which have been optimized for each metal. nSILVER can also be used to protect multi-metal articles, coins with jewels, painted mints and other more complex collector items.

Beneq nSILVER in the jewelry industry

Beneq nSILVER is used on an industrial scale by the follwing companies:

Kalevala Jewelry (FI) Marcel Robbez Masson (FR) Ronda High-Tech (IT)
Jewelry manufacturer Jewelry manufacturer Job coater


More information

nSILVER brochure (pdf).
nSILVER brochure, supplement for mints (pdf).

Contact Lumineq

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Application examples

  • Chip-level ALD moisture barrier for components on tape
  • ALD anti-corrosion coating for semiconductor equipment parts
  • ALD gate dielectric for GaN power devices
  • ALD gate insulator for displays
  • Ultimate moisture barriers for OLED micro-displays from Beneq
  • Lumineq EL40S electroluminescent display by Beneq
  • Transparent electrode for displays by Beneq ALD
  • ALD is the ultimate moisture barrier for PCBs
  • Beneq FBR ALD reactor for moisture barriers of phospor powder
  • Beneq ALD coatings offer protection against corrosion in LED packaging.
  • Beneq ALD provides metal-like coatings for watch parts and fine mechanics.
  • Beneq ALD coatings for wafer-level moisture protection
  • Beneq ALD coatings provide high-quality reflectors for LED
  • Beneq ALD coatings boost the performance of diffractive gratings
  • Beneq provides ALD coatings to protect electronics components from corrosion
  • ALD coatings provide interface layers between materials in CIGS panels.
  • Beneq ALD coatings increase the lifetime of Li-Ion batteries
  • ALD is ideal for optical filters on complex surfaces.
  • Beneq ALD optical coatings increase the lifetime of high power lasers
  • ALD-based conformal moisture barrier coatings for microchannel plates from Beneq.
  • OLED lighting encapsulation with Beneq TFS 600. Fully automated and vacuum-line integrated. For industrial OLED encapsulation.
  • X-ray imaging scintillator plate encapsulation with Beneq Coating Services and Beneq P800 batch coating products

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