How to Make Conductive Ink

Written by marie mulrooney
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Conductive ink is exactly what it sounds like: A coloured liquid that transmits or conducts electricity. You're not likely to dip conductive ink out of an inkwell, though. The conductive particles must be transported within a non-conductive medium that dries or reduces once applied, which then stacks the conductive particles--usually carbon graphite powder or fine metallic flakes--in contact with each other, allowing electricity to be conducted throughout the expanse of conductive ink.

Skill level:
Easy

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Things you need

  • Glass container
  • Black liquid tape
  • Carbon graphite powder, very fine
  • Tuluol or toluene solvent

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Instructions

  1. 1

    Work in a very well-ventilated area--outdoors if possible--and wear gloves to protect your hands from the solvents you're using and safety goggles to protect your eyes.

  2. 2

    Mix three parts carbon graphite powder to two parts liquid tape and six parts Tuloul solvent together in a glass container.

  3. 3

    Use a paint brush or sponge brush to paint the conductive ink you've created onto your target surface.

  4. 4

    Wait until the ink is completely dry to the touch--this should take half an hour or less.

Tips and warnings

  • Add clear cement adhesive to create a thicker conductive glue if you so desire.
  • Most of the materials you need should be available at local hardware stores; carbon graphite powder is often sold as a lubricant.
  • You can use fine silver or copper flakes in place of graphite powder if you wish.
  • Never work with these materials in an enclosed area; the fumes are dangerous.

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