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). Order pens as replacements to use in your Circuit Scribe kits.
Soldering to the ink is possible - but tricky - and greatly depends on paper/surface type and solder type. Circuit Scribe Pen, Single Sold as 1 pen. Order pens as replacements to use in your Circuit Scribe kits.