Electroninks CIRCSPEN1ML10X Circuit Scribe Pen - Pack of 10

Draw on any surface a rollerball pen will write on. The Circuit Scribe conductive ink pen can draw 60-200 meters depending on writing surface and speed (60 meters on absorbent surfaces like a napkin, and 200+ meters on photo paper). Photo paper also has other benefits: you can erase ink by scratching a trace away, and you also get the highest conductivity on this surface (<2 ohms/cm). Soldering to the ink is possible - but tricky - and greatly depends on paper/surface type and solder type.