No passwords, No popups, No cost, No AI:
we earn from 'affiliate link' purchases, making the site possible

Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

finishing.com -- The Home Page of the Finishing Industry

  The authoritative public forum
  for Metal Finishing since 1989

-----

Pink Brass

We are currently etching brass using ferric chloride ⇦ this on eBay or Amazon [affil links] with a nitric acid rinse. Occasionally the brass turns pink. Any idea why and how we can prevent it?

Thank you.

Michael Cocco
Eastern Etching - Chicopee, Maryland
2000

Dear Mr Micheal,

The pink rose like colour is an account of Tarnishing occurring immediately after the etching. This happens faster if you are using heat for drying the brass.

To prevent this use 20 gms / lit of Sodium dichromate to antitarnish the brass before drying.

Regards,

Khozem Vahaanwala
Saify Ind

Bengaluru, Karnataka, India

2000

(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: