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Pickling the bronze doors for the U.S. Capitol to a dark statuary finish

I'm fabricating the bronze doors for the U.S. Capitol, these doors get a dark statuary finish. I was told there was a pickling solution to aid in the coloring process, along with the darkening agent. If this is true can you tell me what this product is and where I can get it. I'm trying to achieve a more uniform color over the surface of these doors, also having a bit of a hard time getting the acid to react at all on certain pieces. Any help would be great. Thank you

Jon S. Lindsey
Custom metal fabrication - Capitol Heights, Maryland
2006

Dear Jon!
Buy yourself one good book on patination of copper and its alloys (Rowe, Hughes book "The Colouring, Bronzing & Patination of Metals" [adv: this book on eBay, Amazon, AbeBooks] is best on that subject). Good luck!

Goran Budija
- Cerovski vrh Croatia
2006

Dear Jon.
I am a bronze fabricator and finisher what you would want to do is use a product called antique black made by Birchwood Casey. Thanks and good luck Dale

Dale Decker
- Antioch, Illinois, USA
2006

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