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topic 5675

Analysis for Anti Tarnish Efficacy on Silver Plated Items

A discussion started in 2000 but continuing through 2019


Q. Hello!

In our electroplating shop, we perform silver plating finished with an anti-tarnish protection. A quality control test employed to check the efficiency of the anti-tarnish protection involves the exposure of the silver plated items to an environment of hydrogen sulfide. The presence of black spots and burnings is taken as an indication that the anti -tarnish protection is not adequate.

Is this the correct test to be used? Are there standard methods referring to the analysis to be performed in association with electroplating and finishing solutions?

I would appreciate any help on this matter.


Daniela from Malta

Daniela Ciappara
- Mriehel, Malta


Q. I am also interested in knowing a standard sterling silver anti tarnish test. I am also interested in methods of preventing sterling silver tarnish.

Cosmas Kaseke
Jewelry manufacturing - Harare, Zimbabwe

affil. link
3M Silver Protector Strips


A. An article entitled "The Protection of Silver Against Atmospheric Attack" by Gay, Berçot and Pagetti, published in the May 2004 issue of Plating and Surface Finishing will tell you all the options for preventing tarnish.

Ted Mooney, Teds signature
Ted Mooney, P.E. - Pine Beach, New Jersey
Striving to live Aloha


Q. Hello everybody, where can I find the entire article: article entitled "The Protection of Silver Against Atmospheric Attack" by Gay, Berçot and Pagetti, published in the May 2004?
Please any advise will be very well accepted

Alessandro Tessarolo
Silverstar - Italy


A. Plating & Surface Finishing is the journal of the American Electroplaters and Surface Finishers Society ( They can probably sell you a surplus copy of the May 2004 issue. If not, they can xerox the article and mail or fax it to you, presumably at nominal cost.

Ted Mooney, Teds signature
Ted Mooney, P.E. - Pine Beach, New Jersey
Striving to live Aloha


A. Hydrogen sulfide is the correct test.

A 2% solution is made and the articles are placed on top of a container on top of a wire gauze. Also place a comparison article alongside. The time difference between tarnishing of the two pieces will enable you to judge the efficiency of your anti-tarnish solution.

Take Care that you don't put a cover on the articles...The must lie openly on the wire gauze as oxygen/humidity is needed to complete the tarnishing reaction.

deepak whorra
Deepak Whorra
     silver craftwork
New Delhi, India

September 10, 2008

Q. We are a gold jewelry manufacturer in Turkey.
Now we have started to produce jewelry in silver.
Please recommend us how we protect the brilliant surface against tarnish effect.

Recep Kurt
factory manager - Istanbul, Turkey

December 12, 2008

Q. Attn: Daniela Ciappara & Mr. Deepak

Dear Sir,

How to check the TARNISHING of SILVER COATING? The silver coating is not coated with any anti-tarnishing coat. Even in H2S test, how to co-relate the data? Hrs to years.



December 18, 2008

A. We are manufacturing silver anti tarnish and the best method of testing the same would be definitely potassium or ammonium sulfide test. We have inferred that 2 minutes of withstanding in the sulfide test corresponds to at least 6 months of atmospheric tarnish prevention in atmosphere in real time, but the only varying factor is the sulfide content in atmosphere. The coastal areas are more prone to tarnish than the interiors due to the high sulfur content in the atmosphere.

Mukund Shinde
- Mumbai, Maharashtra, India

September 26, 2019

Q. May I ask, whoever knows, the procedure of anti-tarnish test using potassium sulfide?


Jessie Mojica
Zen Metal Coating & processing Corporation - Sto Tomas Batangas Philippines is possible thanks to our supporting advertisers, including this one:


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