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

World's #1 on-line resource since 1989

-----

Oxidizing copper bands



2002

I'm a fashion student, and I'm making an outfit with copper bands. I'm trying to oxidize them, and make them that great verdi gris colour. I've tried lemon juice, vinegar and bleach, but none of them accomplish anything. Does anybody know anything that may work?

Thanks in advance! :)

David Wigley
- Toronto, Ontario, Canada


2003

I am a serious amateur photographer and am looking for the same result - greenish copper finish - for a framing solution. Thank you for forwarding the method.

Tina Mortimer
- Tokyo, Japan


2003

I don't yet know if this works but while looking for the answer to the same question you both have I came across this. I will try it and I hope I have helped you guys out.

Brushing the copper sheet with a dilute solution of sulfuric acid [H2SO4] will form copper sulfate, the aqua blue tint seen on old copper [due to the action of acid rain].

Use Rubber Gloves [affil. link to info/product on Amazon] and eye protection and adult supervision [if necessary].

Sulphuric acid is available from automotive supply centers as battery acid. Start with a dilution of at least five parts water to one acid. ALWAYS ADD THE ACID TO THE WATER WITH STIRRING

NEVER ADD WATER TO CONCENTRATED ACID [it could explode in your face]

Brush the solution on and wait a few moments for results. You'll have to experiment a bit to get the effect you seek.

To stop the coloration, rinse the acid off with a lot of fresh running water.

Felicity Stevenson
- Australia


2005

Again, is this the same method as natural copper oxidization, which often produces the substance Malachite? Is this the famed patina finish everyone goes gaga over?

Thanks.

Will Thompson
- Holly, Michigan

----
Ed. note: You may also wish to read our FAQ about patina finishes.


2006

Re: oxidizing copper to make it look age


Brushing the copper sheet with a dilute solution of sulfuric acid [H2SO4] will
form copper sulfate, the aqua blue tint seen on old copper [due to the action
of acid rain].

Use gloves and eye protection and adult supervision [if necessary].

Sulphuric acid is available from automotive supply centers as battery acid.
Start with a dilution of at least five parts water to one acid.

ALWAYS ADD THE ACID TO THE WATER WITH STIRRING

NEVER ADD WATER TO CONCENTRATED ACID [it could explode in your face]

Brush the solution on and wait a few moments for results. You'll have to
experiment a bit to get the effect you seek.

To stop the coloration, rinse the acid off with a lot of fresh running water.

Dawn Butz
- Tucson, Arizona, USA

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