Would like to create controlled rust art.
I want to get a piece of sheet metal. Then create a stencil and rust the remaining piece of metal. To create an image out of the rust. Once the work is done I don't want the rust to spread but to remain as is. Any idea how to do this. I know you can rust metal using chlorine and vinegar but the idea of making chlorine gas and a toxic mess is not appealling. Thanks for your help.?