Electrolytic Etching of Brass - The Steampunk Workshop. Update: I'm often asked about the thickness, type, and source of brass I used for these journals.
I am very lucky to have a local place, Metal Source, were I buy most of my supplies. I used 22 ga. (.025") brass and any alloy will do. In a pinch you can buy brass door kick plates at your local home center, but you will need to strip the lacquer. If you can't find any local source you can buy online, but this is the most expensive option.