Have you tried a copper patina finish? - The Rusted Roan

Traditional Rainbow Patinas – Sculpt Nouveau

Traditional Copper Rust and Patina Stain Technique

How to Realistic Looking Rust/Copper Patina/Faux Finishes

Barry's Copper Patina Rescue Homeowner Kit – Your First Aid Kit for Copper, Bronze and Brass! Copper Patina Rescue is the ORIGINAL and ONLY manufacturer-supported and recommended product to restore the original genuine oil-rubbed brown to black patina found on most sinks, hardware, tables and faucet fixtures. Our kit will also allow you to convert a bright metal finish on any of these metals to an oil-rubbed look.

Barry's Restore It All Products Copper Patina Rescue Homeowner Kit

Amazing Real Copper Patina Finishes, Copper Sheets

DIY Aged Copper Patina Tutorial - Prodigal Pieces

Clear coating to seal a rust patina finish on metal, p2

To Patina or to Not Patina: Our Guide to the Highly Desired Aged Copper Look - Paykoc Imports, Inc.

The Rusted Roan- Handcrafted Home Decor

How to Patina Copper Quickly, DIY Copper Patina

Copper Patina

First attempt at shipwreck patina on copper : r/knives