Experiment with paper electronics with this silver conductive ink pen that will let you draw traces! We like the make of this pen, it has a nice
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Buy Conductive Silver Ink Pen - Micro Tip ADA515 Adafruit
CircuitWriter Conductive Ink, silver-based, 4g : Conductive Adhesives : Office Products
Buy Conductive Silver Ink Pen - Micro Tip ADA515 Adafruit
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Conductive Silver Ink Pen - Micro Tip - CW2200MTP - Electra
6ml Conductive Ink Pen Circuit Draw Instantly Electric Repair DIY Tool Kids Gift L69A - AliExpress