No registration, no passwords; no pop-up ads -- just aloha, fun, & authoritative answers.
As an eBay Partner & Amazon Affiliate we receive compensation for qualifying purchases.
Home /
T.O.C.
FAQs
 
Good
Books
Ref.
Libr.
Advertise
Here
Help
Wanted
Current
Q&A's
Search 🔍
the Site
pub  Where the world gathers for
plating, anodizing, & finishing Q&As since 1989





-----

Streaky Brass Patina Problem




I am currently doing a very large casino project and have done a bit of patina work in the past,the problem is, is the brass and copper sheets are fairly large and wiping on b.c.antique black tends to leave the lines where the B.C. overlaps.I've run across this before but on smaller pieces I just burnish it out. Is there an easier way to apply the chemicals as to not leave streaks on the panels,there are a lot of them and my co.is counting on me to pull this off .

THANKS

RICK HARDMAN
- Portland OR
2001



"The Colouring, Bronzing and patination of Metals"
by Hughes & Rowe

on AbeBooks

or eBay
or
Amazon

(affil links)

Rick - I would suggest using an immersion method. Get a tank big enough to hold the sheet, and submerge the piece until it has the desired finish. Keep in mind that the tank doesn't have to be enormous - it may be built just deep enough to lay the piece flat inside and be completely covered in solution (kind of like a big tray). Good luck.

Dan Brewer
chemical process supplier - Gurnee, Illinois
2001



I have created patina on copper sheets in a tall skinny tank where sheets were suspended by one edge, then edge metal above solution that was not patinated, got sheared off. This solved problem of variations across sheet.

Also tried applying patination chemicals using an automated spray head, with slightly overlapping spray pattern, which worked across the sheet while it was moving on a conveyor underneath. Would expect brass to respond equally well. I found that mechanically sanding the surface dry produced the best activation, also.

W. Carl Erickson
- Rome, New York
2001




(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a 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  -  ©1995-2024 finishing.com, Pine Beach, New Jersey, USA  -  about "affil links"