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 ...

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 ...