Circuit Marker

I made the mistake of not reading the details and assuming it was like the competition and could write on anything. It is meant to be used on glossy photo paper only. Once I figured that out, it worked great but had I known (my fault), I would have spent the extra couple bucks on the competition.

Seems to oxidize quickly. You can use this immediately, but if you let it sit for more than a few hours, it will oxidize and not connect properly anymore.

Seemed like a fun idea, but I couldn't get mine to work for even the most simple circuits. Hopefully you have better luck than I did.