Learn how to create corroded copped, or just download the material.
Anthony Pilon writes:
Tutorial for a corroded copper material, with downloadable shader and test model (The tutorial uses Happy Buddha, but the version on BlenSswap has one I sculpted myself)
I take a quick look at the scene setup for a product-type render, then dive into my process of making a shader like this.
That's all for now, I hope this material can be useful to someone!