Jump to content

Whats the chemical for "chemically blackening"?

Recommended Posts

30. Black (For Cast Bronze and Brass) Ingredients  


Heat immersion - 1 minute.

When article is immersed in hot solution (120-140°F, 50-60°C) a succession of colors is produced. It changes to a purplish color after about 45 seconds. The color darkens quickly and the article is removed after about 1 minute. Wash thoroughly in hot water and air dry, wax finish.


Here is a link to the rest of the formulae:


Edited by xken
Link to comment
Share on other sites

The best blackening agent I ever used was ferric chloride and ammonia, based on a technique described in Model Shipwright. It was a very nasty concoction, however, and extreme caution was used while preparing and using it. I have had mixed success with Jax products and also very good success with automotive spray paint primer and matte or flat black finishes.


Ken - your formula is for cast brass but I assume it works for other brass as well?

Link to comment
Share on other sites

I used to mix some solution. I do not exactly remember the recipe but it came from jewelry.

there was ammonia about 30% and copper nitrate powder and water to adjust the %.


You do not want to smell ammonia because it can put you down very fast!!!

Edited by Gaetan Bordeleau
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Create New...