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Clear coating of Silver for Anti-tarnish




I recently had some silver lacquered. One piece I'd like to put near a window that receives sunlight. Will sunlight harm or degrade the lacquer coating? Is there any specific environment in which lacquered silver should be kept? Thank you

Larry Bains
- Orlando, Florida
March 25, 2021


A. Hi Larry. Since it was done recently I think you should try to contact the company which did the lacquering and ask them.

15129-1_stop_signs
(this is what happens when UV protection is not taken into consideration)

There are many different clearcoats and 'lacquers' and I don't think the same answer would apply to all of hem :-(

Luck & Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey


Like Ted said there are many different clearcoats and 'lacquers' - some of them are very tough and some are less stable. Try to read next article by American Institute of conservation:
http://resources.culturalheritage.org/osg-postprints/wp-content/uploads/sites/8/2015/02/osg006-04.pdf
Hope it helps and good luck!

Goran Budija
- Cerovski vrh Croatia




⇩ Closely related postings, oldest first ⇩



Q. I am looking for a clear coat that we can apply over sterling silver so that it will not tarnish. We would like this coating to last at least 1 year - longer if possible.

Mike Masciarelli
makes silver jewelry - Marlboro, Massachusetts
2003




RFQ: I am looking for a clear coat for my silver plated jewelry. I have the plater and want to use a non spray coat.

Diane D [last name deleted for privacy by Editor]
Jewelry maker - La Mesa, California, USA
2007

Ed. note: Sorry, this RFQ is outdated so private contact is no longer available, but public technical replies are still welcome! No public brand/source suggestions please ( huh? why?)



Q. Regarding old silver/silverplated flatware and holloware.

What is the most economical way to apply a clear coat/lacquer finish to prevent tarnishing. Is a clear coat or lacquer the best finish? What other options are there? I have heard of E-coating, would this be suitable?

We are in the business of producing many household items, recycled from flatware and holloware. One of our main lines is wind chimes, so the element factor would come in to play on deciding what finish would work best.Our goal is to offer an extra service of sealing/finishing the piece(s).

Thank you!

Stuart M. Torkington
- Havana, Florida
1999


A. Hi Mike, Diane, Stuart. As you probably realize, there is very rarely actually a "best" way. If there were, the other ways would quickly fade out of existence.

Some ways to anti-tarnish silver include organic preservatives, chromate treatments, flash plating with rhodium, and clear coats of many types including e-coating, UV-curable lacquer, 2k clearcoats, and other lacquers and clearcoats. Let's very briefly introduce them:

Preservatives like VCIs (volatile corrosion inhibitors) might be helpful in a showroom or museum case and during storage. Chromate treatments might be good for electronics, but should not be used on jewelry or food service because of toxicity. Rhodium is a very expensive precious metal that is bright and tarnish proof; a thin layer electroplated onto the silver is very effective in deterring tarnish but is probably impractical for large items and outdoor exposure.

Clearcoats are transparent lacquers or paints applied and cured by a variety of methods, each method having some advantages and disadvantages. E-coating is a way to apply an exceptionally thin and even clearcoat but the equipment is expensive and somewhat complex (you may find letter 45245, "E-coating for silver jewelry", interesting). More accessible to hobbyists would be UV (ultraviolet) cured lacquers because the coatings are hard and durable but the curing machines are cheap (UV cured lacquers/nail polish are applied to women's nails by manicure shops). 2k (two-component) automotive clearcoats are another possibility and widely available at auto body shops; mixing the two components initiates a chemical reaction that hardens them. Then there are solvent based or water based lacquers which can dry in the air or in an oven; there is nothing really wrong with these, it is just that "drying" is just one of many ways for a finish to cure and, like every other method, it offers strengths and weaknesses.

For the case of Mike's silver jewelry, I'd probably look at rhodium plating first; for Diane's non-spray clearcoat, e-coating sounds in order; for Stuart's wind chimes, I'd probably look first at the 2k automotive clearcoats first since they are made for outdoor exposure and large items, and have been proven on millions of automobiles. Good luck all.

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey




Is lacquering safe for food service silverware?

Silver Anti-tarnish Strips

on eBay or

Amazon

(affil links)

Q. I want to have my silver pieces refinished. Some will be used with food: trays, spoons, etc. I also want to minimize having to polish the pieces, so I'm thinking of having them lacquered at the last stage. Is this safe for food consumption?

Rene Dalandan
musician - Orangeburg, New York
2006


A. Keep your silver clean and try 3M silver protection strips. In principle, clearcoat can be used only for exhibition pieces. Visit society of american silversmiths website(www.siversmithing.com/).
Good luck!

Goran Budija
- Cerovski vrh Croatia




What clear coating for silver jewelry will never yellow

Q. Which is the most suitable clear lacquer for silver jewelry. It shall not have yellow touch and should provide good tarnish resistance. Thanks.

Ayush Agarwal
- New Delhi, Delhi, India
June 7, 2013




Q. We love them, but ladies are tough on us. Ladies can be highly abusive to the jewelry we manufacture.

We are looking for a very hard, scratch resistant, gloss clear, non yellowing, EVER, coating.

The coating will be used to protect sterling silver and/or precious stones such as Mother of Pearl (Shell), etc.

Thank you for your consideration,

Jon

Jon Olson
manufacturer - Presque Isle, Wisconsin
May 20, 2014


A. Hi. As mentioned earlier in the thread, there are many approaches based on end use, volume, capital cost, etc. If I was a medium to large manufacturer of jewelry, I would spend a lot of time researching UV/EB (radiation cured) clear coatings such as are now used on the plastic lenses of most automobiles. The scratch resistance and non-yellowing is quite impressive. The equipment for true professional application probably costs a hundred thousand dollars though. See what Radtech can tell you. Good luck.

Regards,

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey


A. Try ProtectaClear by Everbrite [a finishing.com supporting advertiser]. Hope it helps and good luck!

Goran Budija
- Zagreb,Croatia


A. Rhodium plating.

jeffrey holmes
Jeffrey Holmes, CEF
Spartanburg, South Carolina


Argentium Silver Earrings

on eBay or

Amazon

(affil links)

A. Try Argentium® sterling or platinum sterling® silver alloys, somewhat expensive but tarnish resistant ... Hope it helps and good luck!

Goran Budija
- Zagreb,Croatia


A. Try to make Passivation, such as EVABRIGHT (Enthone) .
Good luck

Sittikorn Rakjai
- Bangkok , Thailand
August 20, 2014




A. Hi, I am a semi retired paint chemist and busy on a "review of Silicate Coatings". Silicate coatings are inorganic and contain no allergenic or other organic compounds as you will find in the mentioned organic clear coats.
Unfortunately I do not have supplier details but you could do an internet search for "Clear Silicate Metal coatings".
As Silicates are really "Glass coatings" they are hard and long lasting. Application would not require special equipment or knowledge.

Ken Marx
- Durban. South Africa
April 7, 2016


A. Umicore has a product called Sealing 691 which provides anti-tarnish and light scratch resistance for silver (sorry for mentioning a name brand product, but I wanted to include that the product I mentioned does not contain chrome).

Julie Richardson
- Houston, Texas USA
February 10, 2017


A. Tarnish-Me-Not will work best.

Benjamin Soyer
- Boston, Massachusetts, USA
June 26, 2017


----
Ed. note: If we printed "I tried brand Blah-blah and it sucks", we'd hear from their lawyers. So product reviews will be unbalanced & unrealistically favorable :-)
For this and other reasons (huh? why?) we ask people to try their best to discuss technology rather than brands :-)
Thanks!



Q. Like umpteen jewelers, I am searching to tarnish proof (or at least significantly retard) silver OR copper pieces, both plated or unplated.
I have two items I am testing ... had any any experience with these?
- One is an acrylic clear coat (designed to protect gold and silver leaf)
- The other is a lacquer finish coat made for models.
Are either of these good? Does either tend to yellow more than the other? Wear and tear? Anything else,
Thank you!

Katharine Wood
- Bronx, New York, USA
January 21, 2018




Avoiding corrosion in Silver-Plated C10100 Bus Bars, without plating

Q. I have a client who does not like gold-plated conductors/connectors in their products. Their preference is silver, but that would require periodic cleaning and maintenance. I am making a product for them with C10100 copper bars that I would like to get silver plated but am concerned about the formation of silver oxide. Is there a treatment option for silver that will prevent corrosion or the formation of oxides, without requiring a coating of a different metal? Their position is that a different metal coating the bus bar would present a different sound characteristic for their target customers. I would like to accommodate them.

Could you offer any resources where I might research my question to find an answer?

Thanks in advance,

Cody Dowling
Founder- Upstream Audio & Acoustics - McKinney, Texas, USA
August 13, 2018


A. Hi Cody. Although tin, nickel, or electroless nickel plating might be better than silver plating, yes, there are organic corrosion inhibitors for silver. It may be practical to use VCI strips or chemicals in some fashion to deter silver corrosion. Threads 1734, 1977, 3946, 4932, 5675, and 35576 and others also address this perennial problem of deterring silver tarnish.

Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey


thumbs up sign Hi Mr. Mooney,

Thank you for your help (and for pointing me to this helpful thread).

For anyone who may have been confused by the title, what I meant to say was "..., without over-plating the silver".

Thanks in advance!
Cody

Mr. Cody Dowling [returning]
Upstream Audio & Acoustics - McKinney, Texas, USA




Sealing silverware to make it dishwasher safe

Q. I have a lot of silver (plated?) cutlery which belonged to my grandmother. My sister has the same and she's able to put this in the dishwasher as the cutlery has been sealed. The problem is I don't know what can be used, and where it can be done as I live in another country than my sister. I can't seem to find anyone in The Netherlands. Any tips?

kelly krieger
- Loosdrecht, NH The Netherlands
February 26, 2019




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