found via a cooltools email
text from youtube "Leah of Seejanedrill shares a surprising metalworking HACK. Leah demonstrates and explains how to etching metal using a 9 volt battery.
Supply List:
9 volt battery or a battery charger
white vinegar
table salt
a resist such as vinyl letters, vinyl stencil, sheet vinyl, fingernail polish etc.
alligator clips "
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