M.N. Projects got a lot of questions about how he etches his initials onto his metalworking projects, so he did a quick HOWTO for those who want to try it themselves.
With the exception of the vinyl stencils, many people probably have this stuff lying around the house.
He etches his initials in after reshaping this rusty leaf spring into a beautiful knife:
• How to easily Etch the Logo in Steel using salt and batteries. A short Tutorial (YouTube / M.N. Projects)