Here’s two hacks to etch your own boards at home in just a few ... He used Muratic (Hydrochloric) acid and Hydrogen Peroxide with a sponge to wipe that copper away. The trick in this, we ...

Such badges are easy enough to make with a CNC machine, but if you don’t have access to machine tools you can put chemistry to work for you with these acid-etched brass nameplates. The etching ...

When locals scrubbed it clean, they saw the words "Tsunami Kinen-seki" (Tsunami memorial stone) etched into it. The boulder, weighing 32 tons, had been washed ashore from the mouth of a river by ...