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Change the color of solder to a copper color

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Years ago I worked at a Architectural metal fabrication company, which we mainly dealt with Fabricated Copper sheet products. I used to use a chemical to change the color of a soldered or silver soldered joint to a "Copper colored finish". A friend of mine just asked me what that "Blue crystal chemical" was and were he could buy some? Well, I do not remember, so can you help? I used to dip a clean acid brush in water and then dab some of this "Blue Crystal Chemical" on the wet acid brush, and then I would brush over the silver soldered or soldered area and the solder color would change to a "Copper" color when it dried. Please help to refresh my memory.

Thank you,

Ron S deleted
- Mesa, Arizona, U.S.A.


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Sounds like copper sulfateamazoninfo, Ron. Good luck with it.

pic of Ted Mooney Teds signature
Ted Mooney, P.E. RET
finishing.com
Brick, New Jersey

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There must be more to this technique. I bought the blue crystal copper sulphate and used a brush to apply it to the solder, but there was no reaction. What steps am I missing? Should I crush the crystals into powder first? Thanks, Tara

Tara Wdeleted
- Dry Prong, Louisiana


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I don't know of any chemical that changes silver to copper BUT there is a way that we do "copper plating" and it does work and that's steel wool [linked by editor to product info at Rockler] and what the jewelry ind. calls pickle acid turns anything copper really and is cheap, also use to be and I am having a hard time finding copper colored solder that would stay copper even after you heated it and soldered the project when I first used it tho I found it very hard to melt and didn't hold up like I thought it should. pickle acid is sold any place that sells jewelry equipment and is most of the time in powder form and you just mix it with hot water according to the amount needed steel; bailing wire and steel wool are cheap and work well and afterwards use a spray fix or clear gloss to keep it from chipping off at any time cause its not really a heavy coat that will last to things like patinas it with Liver Of Sulphur [linked by editor to product info at Mister Art] or any ammonia very well

Evan
- Colorado


March 29, 2011

It is copper patina available at any stained glass supply store. It is sold under different names and makers, but is all copper patina. It is a blue cyrstal-ish solution, and is very inexpensive.

Kerri
- Hickory, North Carolina, USA

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