[Brain] wanted to mark some scissors with his Ortur laser engraver. The problem? The laser won’t cut into the hard metal of the scissors. His solution? Smear the scissors with mustard. No ...

Stainless steel is an alloy of iron and some chromium ... The calcium oxide washes off but the chromium sulfate causes the etch. Next time you’re at your local space, give this a try.

Explores the technology behind drawing on metal using electrochemical artistic etching. Watch as a pattern is created on a stainless steel knife using a Krone battery as a direct current source.