A bit of nail polish, a container of salt water, a 9V battery, a Q-tip, and some alligator leads. That’s pretty much it. Easy, inexpensive process from Instructables user lasersage appears to give impressive results.
I am descended from 5,000 generations of tool-using primates. Also, I went to college and stuff. I am a long-time contributor to MAKE magazine and makezine.com. My work has also appeared in ReadyMade, c’t – Magazin für Computertechnik, and The Wall Street Journal.