Home /
T.O.C.
FAQs
 
Good
Books
Ref.
Libr.
Advertise
Here
Help
Wanted
Current
Q&A's
Search 🔍
the Site

Chime right in! (no registration req'd)

-----

"Electroforming gold jewelry on copper, and can't remove last traces of copper"





April 26, 2010

Hi I am goldsmith I work in gold tube bracelets and necklaces,we start the work by coating a copper rod of one c.m. diameter ,with a plate of gold of 0.05 mm. thick,then we continue the process by lowering the diameter of the copper rod which is plated with gold to nearly 0.15-0.2,then we make the bracelet, and after finishing completely we put the bracelet in nitric acid in order to get rid of the copper inside the bracelet,the question is, a thin layer of copper is still sticking to the gold from inside the tube,which is causing to lower the degree of gold,the nitric acid is not cleaning completely, so may someone can show me a way to get rid of that thin layer of copper, will be very grateful

Gar SHAH
PRODUCT DESIGNER - BEIRUT, LEBANON
^


April 27, 2010

Hi, Gar. There may be a good reason why you do what you do (my knowledge of jewelry making is limited), but why are you electroforming on copper instead of easier to dissolve materials like wax or aluminum?

Regards,

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


May 5, 2010

u boil the jewellery in nitric acid.use 71% pure nitric acid.

Bhupesh Mulik
jewellery - Mumbai, India
^


September 27, 2011

H2SO4 3 parts and nitric acid 1 part

Majed Janineh
- Beith Lehem Palistain
^

none
finishing.com is made possible by ...
this text gets replaced with bannerText
spacer gets replaced with bannerImages

Q, A, or Comment on THIS thread SEARCH for Threads about ... My Topic Not Found: Start NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories:

 
Jobshops
Capital
Equipment
Chemicals &
Consumables
Consult'g, Train'g
& Software


About/Contact    -    Privacy Policy    -    ©1995-2021 finishing.com, Pine Beach, New Jersey, USA